A particular small polypeptide is nine amino acids long. Usingthree different enzymes to hydrolyze the polypeptide at various sites, we obtain the followingfive fragments (N denotes the amino terminus of the chain):
Ala-Leu-Asp-Tyr-Val-Leu
Tyr-Val-Leu
N-Gly-Pro-Leu
Asp-Tyr-Val-Leu
N-Gly-Pro-Leu-Ala-Leu
Determine the primary structure of this polypeptide.