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.
Note that tyrosine is really an essential amino acid, as it is synthesized by the hydroxylation of phenylalanine, an essential amino acid. Also, in animals, the sulfhydryl group of cysteine is derived from methionine, which is an essential amino acid, so cysteine can also be considered essential. The ten essential amino acids are: