Crossword Clue:

CYSTEIN an amino acid also CYSTEINE CYSTINE

AnswerCrossword Clue
DOPAAn amino acid
LYSINEAn amino acid
ALANINAn amino acid
ALANINEAn amino acid: Chem.
LEUCINEAn essential amino acid
DOPAAn amino acid, for short
PABAInitials for an amino acid.