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Tilgængelig på 37 sprog" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-37" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">37 sprog</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%86%D8%B8%D8%A7%D9%85_%D8%A7%D9%84%D8%B2%D9%85%D8%B1_%D8%A7%D9%84%D8%AF%D9%85%D9%88%D9%8A%D8%A9_ABO" title="نظام الزمر الدموية ABO – arabisk" lang="ar" hreflang="ar" data-title="نظام الزمر الدموية ABO" data-language-autonym="العربية" data-language-local-name="arabisk" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/ABO_sistem_krvnih_grupa" title="ABO sistem krvnih grupa – bosnisk" lang="bs" hreflang="bs" data-title="ABO sistem krvnih grupa" data-language-autonym="Bosanski" data-language-local-name="bosnisk" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Sistema_d%27agrupament_sanguini_AB0" title="Sistema d'agrupament sanguini AB0 – catalansk" lang="ca" hreflang="ca" data-title="Sistema d'agrupament sanguini AB0" data-language-autonym="Català" data-language-local-name="catalansk" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs badge-Q70894304 mw-list-item" title=""><a href="https://cs.wikipedia.org/wiki/Krevn%C3%AD_syst%C3%A9m_AB0" title="Krevní systém AB0 – tjekkisk" lang="cs" hreflang="cs" data-title="Krevní systém AB0" data-language-autonym="Čeština" data-language-local-name="tjekkisk" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/AB0-System" title="AB0-System – tysk" lang="de" hreflang="de" data-title="AB0-System" data-language-autonym="Deutsch" data-language-local-name="tysk" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-dv mw-list-item"><a href="https://dv.wikipedia.org/wiki/%DE%87%DE%AD%DE%84%DE%A9%DE%87%DE%AF_%DE%8D%DE%AD%DE%8E%DE%AC_%DE%8E%DE%AA%DE%83%DE%AB%DE%95%DE%B0%DE%8E%DE%AC_%DE%82%DE%A8%DE%92%DE%A7%DE%89%DE%B0" title="އޭބީއޯ ލޭގެ ގުރޫޕްގެ ނިޒާމް – divehi" lang="dv" hreflang="dv" data-title="އޭބީއޯ ލޭގެ ގުރޫޕްގެ ނިޒާމް" data-language-autonym="ދިވެހިބަސް" data-language-local-name="divehi" class="interlanguage-link-target"><span>ދިވެހިބަސް</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/ABO_blood_group_system" title="ABO blood group system – engelsk" lang="en" hreflang="en" data-title="ABO blood group system" data-language-autonym="English" data-language-local-name="engelsk" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Sistema_de_grupos_sangu%C3%ADneos_ABO" title="Sistema de grupos sanguíneos ABO – spansk" lang="es" hreflang="es" data-title="Sistema de grupos sanguíneos ABO" data-language-autonym="Español" data-language-local-name="spansk" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/AB0-s%C3%BCsteem" title="AB0-süsteem – estisk" lang="et" hreflang="et" data-title="AB0-süsteem" data-language-autonym="Eesti" data-language-local-name="estisk" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%DB%8C%D8%B3%D8%AA%D9%85_%DA%AF%D8%B1%D9%88%D9%87_%D8%AE%D9%88%D9%86%DB%8C_ABO" title="سیستم گروه خونی ABO – persisk" lang="fa" hreflang="fa" data-title="سیستم گروه خونی ABO" data-language-autonym="فارسی" data-language-local-name="persisk" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/ABO-veriryhm%C3%A4j%C3%A4rjestelm%C3%A4" title="ABO-veriryhmäjärjestelmä – finsk" lang="fi" hreflang="fi" data-title="ABO-veriryhmäjärjestelmä" data-language-autonym="Suomi" data-language-local-name="finsk" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Syst%C3%A8me_ABO" title="Système ABO – fransk" lang="fr" hreflang="fr" data-title="Système ABO" data-language-autonym="Français" data-language-local-name="fransk" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Sistema_AB0" title="Sistema AB0 – galicisk" lang="gl" hreflang="gl" data-title="Sistema AB0" data-language-autonym="Galego" data-language-local-name="galicisk" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%8F%E0%AA%AC%E0%AB%80%E0%AA%93_%E0%AA%B0%E0%AA%95%E0%AB%8D%E0%AA%A4%E0%AA%B8%E0%AA%AE%E0%AB%81%E0%AA%B9_%E0%AA%AA%E0%AB%8D%E0%AA%B0%E0%AA%A3%E0%AA%BE%E0%AA%B2%E0%AB%80" title="એબીઓ રક્તસમુહ પ્રણાલી – gujarati" lang="gu" hreflang="gu" data-title="એબીઓ રક્તસમુહ પ્રણાલી" data-language-autonym="ગુજરાતી" data-language-local-name="gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%8F%E0%A4%AC%E0%A5%80%E0%A4%93_%E0%A4%B0%E0%A4%95%E0%A5%8D%E0%A4%A4_%E0%A4%B8%E0%A4%AE%E0%A5%82%E0%A4%B9_%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A4%A3%E0%A4%BE%E0%A4%B2%E0%A5%80" title="एबीओ रक्त समूह प्रणाली – hindi" lang="hi" hreflang="hi" data-title="एबीओ रक्त समूह प्रणाली" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%B1%D6%80%D5%B5%D5%A1%D5%B6_%D5%AD%D5%B4%D5%A2%D5%A5%D6%80%D5%AB_ABO_%D5%A4%D5%A1%D5%BD%D5%A1%D5%AF%D5%A1%D6%80%D5%A3%D5%B8%D6%82%D5%B4" title="Արյան խմբերի ABO դասակարգում – armensk" lang="hy" hreflang="hy" data-title="Արյան խմբերի ABO դասակարգում" data-language-autonym="Հայերեն" data-language-local-name="armensk" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Sistem_golongan_darah_ABO" title="Sistem golongan darah ABO – indonesisk" lang="id" hreflang="id" data-title="Sistem golongan darah ABO" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesisk" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/ABO-bl%C3%B3%C3%B0flokkar" title="ABO-blóðflokkar – islandsk" lang="is" hreflang="is" data-title="ABO-blóðflokkar" data-language-autonym="Íslenska" data-language-local-name="islandsk" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Sistema_AB0" title="Sistema AB0 – italiensk" lang="it" hreflang="it" data-title="Sistema AB0" data-language-autonym="Italiano" data-language-local-name="italiensk" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/ABO%E5%BC%8F%E8%A1%80%E6%B6%B2%E5%9E%8B" title="ABO式血液型 – japansk" lang="ja" hreflang="ja" data-title="ABO式血液型" data-language-autonym="日本語" data-language-local-name="japansk" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%8E%E0%B2%AC%E0%B2%BF%E0%B2%92_%E0%B2%B0%E0%B2%95%E0%B3%8D%E0%B2%A4_%E0%B2%97%E0%B3%81%E0%B2%82%E0%B2%AA%E0%B3%81_%E0%B2%B5%E0%B3%8D%E0%B2%AF%E0%B2%B5%E0%B2%B8%E0%B3%8D%E0%B2%A5%E0%B3%86" title="ಎಬಿಒ ರಕ್ತ ಗುಂಪು ವ್ಯವಸ್ಥೆ – kannada" lang="kn" hreflang="kn" data-title="ಎಬಿಒ ರಕ್ತ ಗುಂಪು ವ್ಯವಸ್ಥೆ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="kannada" class="interlanguage-link-target"><span>ಕನ್ನಡ</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/ABO%EC%8B%9D_%ED%98%88%EC%95%A1%ED%98%95" title="ABO식 혈액형 – koreansk" lang="ko" hreflang="ko" data-title="ABO식 혈액형" data-language-autonym="한국어" data-language-local-name="koreansk" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/S%C3%AEstema_ABO_%C3%BB_komeley%C3%AAn_xw%C3%AEn%C3%AA" title="Sîstema ABO û komeleyên xwînê – kurdisk" lang="ku" hreflang="ku" data-title="Sîstema ABO û komeleyên xwînê" data-language-autonym="Kurdî" data-language-local-name="kurdisk" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%8E%E0%B4%AC%E0%B4%BF%E0%B4%92_%E0%B4%AC%E0%B5%8D%E0%B4%B2%E0%B4%A1%E0%B5%8D%E0%B4%97%E0%B5%8D%E0%B4%B0%E0%B5%82%E0%B4%AA%E0%B5%8D%E0%B4%AA%E0%B5%8D_%E0%B4%B8%E0%B4%BF%E0%B4%B8%E0%B5%8D%E0%B4%B1%E0%B5%8D%E0%B4%B1%E0%B4%82" title="എബിഒ ബ്ലഡ്ഗ്രൂപ്പ് സിസ്റ്റം – malayalam" lang="ml" hreflang="ml" data-title="എബിഒ ബ്ലഡ്ഗ്രൂപ്പ് സിസ്റ്റം" data-language-autonym="മലയാളം" data-language-local-name="malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Sistem_kumpulan_darah_ABO" title="Sistem kumpulan darah ABO – malajisk" lang="ms" hreflang="ms" data-title="Sistem kumpulan darah ABO" data-language-autonym="Bahasa Melayu" data-language-local-name="malajisk" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nds mw-list-item"><a href="https://nds.wikipedia.org/wiki/AB0-System" title="AB0-System – nedertysk" lang="nds" hreflang="nds" data-title="AB0-System" data-language-autonym="Plattdüütsch" data-language-local-name="nedertysk" class="interlanguage-link-target"><span>Plattdüütsch</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Uk%C5%82ad_grupowy_AB0" title="Układ grupowy AB0 – polsk" lang="pl" hreflang="pl" data-title="Układ grupowy AB0" data-language-autonym="Polski" data-language-local-name="polsk" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Sistema_ABO" title="Sistema ABO – portugisisk" lang="pt" hreflang="pt" data-title="Sistema ABO" data-language-autonym="Português" data-language-local-name="portugisisk" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/ABO_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC_%D0%BA%D1%80%D0%B2%D0%BD%D0%B8%D1%85_%D0%B3%D1%80%D1%83%D0%BF%D0%B0" title="ABO систем крвних група – serbisk" lang="sr" hreflang="sr" data-title="ABO систем крвних група" data-language-autonym="Српски / srpski" data-language-local-name="serbisk" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%8F%E0%AE%AA%E0%AE%BF%E0%AE%93_%E0%AE%95%E0%AF%81%E0%AE%B0%E0%AF%81%E0%AE%A4%E0%AE%BF_%E0%AE%95%E0%AF%81%E0%AE%B4%E0%AF%81_%E0%AE%AE%E0%AF%81%E0%AE%B1%E0%AF%88%E0%AE%AE%E0%AF%88" title="ஏபிஓ குருதி குழு முறைமை – tamil" lang="ta" hreflang="ta" data-title="ஏபிஓ குருதி குழு முறைமை" data-language-autonym="தமிழ்" data-language-local-name="tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/ABO_%E0%B0%B0%E0%B0%95%E0%B1%8D%E0%B0%A4_%E0%B0%B5%E0%B0%B0%E0%B1%8D%E0%B0%97_%E0%B0%B5%E0%B1%8D%E0%B0%AF%E0%B0%B5%E0%B0%B8%E0%B1%8D%E0%B0%A5" title="ABO రక్త వర్గ వ్యవస్థ – telugu" lang="te" hreflang="te" data-title="ABO రక్త వర్గ వ్యవస్థ" data-language-autonym="తెలుగు" data-language-local-name="telugu" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%A3%E0%B8%B0%E0%B8%9A%E0%B8%9A%E0%B8%AB%E0%B8%A1%E0%B8%B9%E0%B9%88%E0%B9%82%E0%B8%A5%E0%B8%AB%E0%B8%B4%E0%B8%95%E0%B9%80%E0%B8%AD%E0%B8%9A%E0%B8%B5%E0%B9%82%E0%B8%AD" title="ระบบหมู่โลหิตเอบีโอ – thai" lang="th" hreflang="th" data-title="ระบบหมู่โลหิตเอบีโอ" data-language-autonym="ไทย" data-language-local-name="thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/ABO_kan_grubu_sistemleri" title="ABO kan grubu sistemleri – tyrkisk" lang="tr" hreflang="tr" data-title="ABO kan grubu sistemleri" data-language-autonym="Türkçe" data-language-local-name="tyrkisk" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0_%D0%B3%D1%80%D1%83%D0%BF_%D0%BA%D1%80%D0%BE%D0%B2%D1%96_AB0" title="Система груп крові AB0 – ukrainsk" lang="uk" hreflang="uk" data-title="Система груп крові AB0" data-language-autonym="Українська" data-language-local-name="ukrainsk" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/H%E1%BB%87_th%E1%BB%91ng_nh%C3%B3m_m%C3%A1u_ABO" title="Hệ thống nhóm máu ABO – vietnamesisk" lang="vi" hreflang="vi" data-title="Hệ thống nhóm máu ABO" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamesisk" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/ABO%E8%A1%80%E5%9E%8B%E7%B3%BB%E7%BB%9F" title="ABO血型系统 – kinesisk" lang="zh" hreflang="zh" data-title="ABO血型系统" data-language-autonym="中文" data-language-local-name="kinesisk" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/ABO%E8%A1%80%E5%9E%8B%E7%B3%BB%E7%B5%B1" title="ABO血型系統 – kantonesisk" lang="yue" hreflang="yue" data-title="ABO血型系統" data-language-autonym="粵語" data-language-local-name="kantonesisk" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q188010#sitelinks-wikipedia" title="Redigér sproglinks" class="wbc-editpage">Redigér links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Navnerum"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet 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<button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">skjul</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Fra Wikipedia, den frie encyklopædi</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="da" dir="ltr"><figure typeof="mw:File/Thumb"><a href="/wiki/Fil:Blut_1000fach_Dunkelfeld.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Blut_1000fach_Dunkelfeld.jpg/400px-Blut_1000fach_Dunkelfeld.jpg" decoding="async" width="400" height="173" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Blut_1000fach_Dunkelfeld.jpg/600px-Blut_1000fach_Dunkelfeld.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b1/Blut_1000fach_Dunkelfeld.jpg/800px-Blut_1000fach_Dunkelfeld.jpg 2x" data-file-width="2153" data-file-height="932" /></a><figcaption>Menneskeblod i 1000 x forstørrelse.</figcaption></figure><figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/Fil:ABO_blood_group_diagram.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/ABO_blood_group_diagram.svg/400px-ABO_blood_group_diagram.svg.png" decoding="async" width="400" height="302" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/ce/ABO_blood_group_diagram.svg/600px-ABO_blood_group_diagram.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/ce/ABO_blood_group_diagram.svg/800px-ABO_blood_group_diagram.svg.png 2x" data-file-width="802" data-file-height="605" /></a><figcaption>AB0-blodtypernes molekylære grundlag. Tegning der viser kulhydratkæderne med placeringen af <a href="/wiki/Kulhydrat" title="Kulhydrat">kulhydraterne</a> <a href="/wiki/Galaktose" title="Galaktose">galaktose</a>, fukose, N-acetyl-galaktose og N-acetyl-glukose, der udgør den molekylære forskel på antigenerne</figcaption></figure> <p><b>AB0</b> (udtales a-b-nul) bruges til at angive tilstedeværelsen af et, begge eller ingen af A- og B- antigenerne på <a href="/wiki/Erytrocyt" class="mw-redirect" title="Erytrocyt">erytrocytter</a>. </p><p>Systemet blev opdaget af <a href="/wiki/Karl_Landsteiner" title="Karl Landsteiner">Karl Landsteiner</a> i 1901, <sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> og det er en samlet oversigt over fire forskellige <a href="/wiki/Blodtype" title="Blodtype">blodtyper</a>. Blodtyperne er genetisk bestemt. Man kan have henholdsvis type A, B, AB eller 0. Betegnelsen fortæller, hvilke <a href="/wiki/Antigen" title="Antigen">antigener</a> man har. Har man type A, har man også antigen A, har man type B har man antigen B, har man type AB har man begge slags, og hvis man har type 0, har man ingen antigener overhovedet. </p><p>Antigener er store molekyler, som kroppens <a href="/wiki/Immunforsvar" title="Immunforsvar">immunforsvar</a> kan genkende, f.eks. proteiner. Antigenerne fra AB0 systemet er en del af overfladen i alle kroppens celler. Også andre organismer, så som <a href="/wiki/Colibakterie" class="mw-redirect" title="Colibakterie">colibakterier</a> har disse antigener. Når kroppens immunforsvar møder nogle antigener, det ikke kender, vil kroppen begynde at danne <a href="/wiki/Antistof_(biologi)" title="Antistof (biologi)">antistoffer</a> mod dette antigen. Det er dog forskelligt fra antigen til antigen, hvor lang tid det tager at danne antistofferne. </p><p>Antistoffer er stoffer, der passer sammen med hver deres bestemte antigen, som en nøgle passer i en lås. Når antistof kommer i kontakt med det antigen, som det passer sammen med, vil det binde sig til antigenet. Et antistof bundet til antigen vil tiltrække neutrofile <a href="/wiki/Hvidt_blodlegeme" class="mw-redirect" title="Hvidt blodlegeme">hvide blodlegemer</a>, der vil omslutte antistoffet, antigenet og det antistoffet sidder på, som regel en bakterie. Blodlegemet ødelægger derefter det hele, sådan at bakterien ikke kan formere sig. </p><p>AB0-antistofferne dannes i løbet af de første 3 måneder, man lever. De dannes, når immunforsvaret kommer i kontakt med colibakterierne i tarmen. Det skyldes, at colibakterierne har visse overfladeproteiner, som ligner antigenerne i AB0-systemet. Når barnets immunsystem har været i kontakt med de fremmede proteiner på colibakterierne, vil det iværksætte en immunreaktion og danne antistoffer. En med blodtype A vil derfor have antistof mod antigen B, og en med blodtype B vil have antistof mod A. En, der har blodtype AB har begge antigener selv, og vil derfor ikke have dannet antistoffer mod nogen af delene. Til gengæld vil en med blodtype 0 have dannet antistoffer mod både antigen A og B. <sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Se_også"><span id="Se_ogs.C3.A5"></span>Se også</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=AB0&veaction=edit&section=1" title="Redigér afsnit: Se også" class="mw-editsection-visualeditor"><span>redigér</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=AB0&action=edit&section=1" title="Edit section's source code: Se også"><span>rediger kildetekst</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Allergi" title="Allergi">Allergi</a></li> <li><a href="/wiki/Erytrocyt" class="mw-redirect" title="Erytrocyt">Erytrocyt</a></li></ul> <div class="mw-heading mw-heading2"><h2 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