The function of SNN (stannin, Ensembl gene identifier ENSG00000184602) is as follows. Plays a role in the toxic effects of organotins (PubMed:15269288). Plays a role in endosomal maturation (PubMed:27015288). {ECO:0000269|PubMed:15269288, ECO:0000269|PubMed:27015288}.