A pentapeptide was found to contain the amino acids Phe, Gly, Met, Ala, and Ser. N-Terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the pentapeptide yielded the dipeptides Gly-Ser, Ala-Gly, and Ser-Met. The peptide sequence is:
a. Ala-Gly-Ser-Phe-Met
b. Ala-Gly-Ser-Met-Phe
c. Phe-Ser-Gly-Met-Ala
d. Phe-Met-Ser-Gly-Ala
e. Phe-Ala-Gly-Ser-Met