Some proteins contain additional amino acids that arise by modification of an amino acid already present in a peptide, examples include

Q. Some proteins contain additional amino acids that arise by modification of an amino acid already present in a peptide, examples include

A.            4 -hydroxy proline

B.            5- hydroxy Lysine

C.            Gamma Amino Butyric Acid

D.            All of the above

Answer: All of the above