Could be involved in the transport of tyrosine, the precursor to melanin synthesis, within the melanocyte. Regulates the pH of melanosome and the melanosome maturation. One of the components of the mammalian pigmentary system. Seems to regulate the postranslational processing of tyrosinase, which catalyzes the limiting reaction in melanin synthesis (By similarity). Belongs to the CitM (TC 2.A.11) transporter family. Questioning colour - Issue 54 of January 2005