NCIt definition : Human TYR wild-type allele is located within 11q14-q21 and is approximately 118 kb
in length. This allele, which encodes tyrosinase protein, plays a role in the multi-step
biosynthesis of melanin from tyrosine. Allelic variants of the TYR gene cause three
different types of oculocutaneous albinism.;
NCIt note : The three types of oculocutaneous albinism caused by tyrosinase deficiency are termed
type IA (tyrosinase-negative), type IB (reduced tyrosinase activity) and type I temperature-sensitive.;