The function of Ensembl gene identifier ENSG00000104044 (OCA2, OCA2 melanosomal transmembrane protein) is as follows. Contributes to a melanosome-specific anion (chloride) current that modulates melanosomal pH for optimal tyrosinase activity required for melanogenesis and the melanosome maturation (PubMed:11310796, PubMed:15262401, PubMed:22234890, PubMed:25513726). One of the components of the mammalian pigmentary system (PubMed:15262401, PubMed:18252222, PubMed:7601462). May serve as a key control point at which ethnic skin color variation is determined. Major determinant of brown and/or blue eye color (PubMed:15262401, PubMed:18252222, PubMed:7601462). Seems to regulate the post-translational processing of tyrosinase, which catalyzes the limiting reaction in melanin synthesis (By similarity). {ECO:0000250|UniProtKB:Q62052, ECO:0000269|PubMed:11310796, ECO:0000269|PubMed:15262401, ECO:0000269|PubMed:18252222, ECO:0000269|PubMed:22234890, ECO:0000269|PubMed:25513726, ECO:0000269|PubMed:7601462}.