Selenocysteine is synthesized from
Selenocysteine is the 21st amino acid. Biosynthesis of Selenocysteine is by replacing the oxygen by selenium in Serine which in turn formed from Cysteine.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 214
Alamine
Cysteine
Arginine
Histidine
Metabolism of protein and amino acid