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Selenocysteine

Chemical compound
Selenocysteine is the 21st proteinogenic amino acid. Selenoproteins contain selenocysteine residues. Selenocysteine is an analogue of the more common cysteine with selenium in place of the sulfur. Selenocysteine is present in several enzymes. Wikipedia
Formula: C3H7NO2Se
Classification: Proteinogenic amino acid
Molar mass: 168.05 g/mol
Acidity (pKa): 5.24, 5.43