I le immunology, self molecules are those components of an organism's body that can be distinguished from foreign substances by the immune system. I le isi itu, non-self molecules are those recognized as foreign molecules. O se tasi o vaega o non-self molecules ua taʻua o antigens (puupuu mo antibody generators) ma ua faʻamatalaina o vailaʻau e faʻapipiʻi i faʻapitoa immune receptors ma faʻaosofia ai se tali puipuia. O pepe faatoa fananau mai e leai se muamua faʻaalia i microbes ma e sili ona afaina i faʻamaʻi pipisi. E tele vaega o puipuiga puipuia e saunia e le tina. I le taimi o le maʻitaga, o se ituaiga faapitoa o antibody, e taʻua o le IgG, e aveina saʻo mai le tina i le pepe e ala i le tina, o lea o tagata o loʻo i ai ni vaega o le tino o le tino o le tino e mafai ona iloga mai i le fanau mai, e oʻo lava i le fetus e ala i le faʻamaʻi. O lenei
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