The House of Tudor was a royal house of Welsh and English origin, descended in the male line from the Tudors of Penmynydd.
Tyrosine (Tyr or Y) or 4-hydroxyphenylalanine is one of the 22 amino acids that are used by cells to synthesize proteins. It is a non-essential amino acid with a polar side group. Its codons are UAC and UAU.
Tyrosine is also the immediate precursor to the thyroid hormone thyroxin and melanin, which is the pigment in the skin that allows for tanning. Deficiencies of phenylalanine or tyrosine may result in interruption of the synthesis of melanin or thyroxin.