Found sometimes in the adrenal gland but more commonly in the eyes, hair, and skin, its absence results in paleness and lack of hair color.
It is produced by the oxidation of tyrosine or tryptophan (TRIP-toe-fan), therefore its production is inhibited in patients suffering from phenylketonuria (fee-null-key-toe-NOO-ree-ah) because the hydroxylation of tyrosine is inhibited by elevated phenylalanine (fee-null-AL-ah-neen) levels. Found sometimes in the adrenal gland but more commonly in the eyes, hair, and skin, its absence results in paleness and lack of hair color. FTP name this black skin pigment, whose production is stimulated by the presence of sunlight.
It is produced by the oxidation of tyrosine or tryptophan (TRIP-toe-fan), therefore its production is inhibited in patients suffering from phenylketonuria (fee-null-key-toe-NOO-ree-ah) because the hydroxylation of tyrosine is inhibited by elevated phenylalanine (fee-null-AL-ah-neen) levels.
melanin