ANTIGENHO (az anti… va yun. gennao – ba vujud ovardan), podzoho, moddahoi tabiatashon begonai organiki, ki mavridi ba organizm firistodan (na az rohi azoi hozima), safedahoi makhsus – podtanho hosil karda, bo onho tasiri tarafayn barqaror menamoyand. A. faqat bo hamon podtanhoe payvast meshavand, ki zeri tasiri khudi onho ba vujud omadaand. Safedaho, polipeptidho, glikolipidho va polisakharidho (bo nom A.-i komil) khosiyati antigeni zohir mekunand. A. dar tashkhisi bemorihoi siroyati farovon korbast meshavand. Dar barobari A.-i komil hamchunin A.-i nokomil niz vujud dorand, mas., gaptenho, ki bo podtanhoi dakhldor tasir rasonand ham, onhoro hosil karda nametavonand. Gaptenho dar surati ba onho ilova kardani safeda ba A.-i komil tabdil meyoband. Baze moddahoi noorganiki, az jumla doruho (antipirin, khinin va g.), hangomi ba organizm vorid shudan bo safedahoi on payvast gashta, khosiyati A.-ro kasb mekunand.