Determine the primary structure of an octapeptide from the following data:
Acid hydrolysis gives 2 Arg, Leu, Lys, Met, Phe, Ser, Tyr.
Carboxypeptidase A releases Ser.
Edman's reagent releases Leu.
Cyanogen bromide forms two peptides with the following amino acid compositions:
1. Arg, Phe, Ser
2. Arg, Leu, Lys, Met, Tyr
Trypsin forms the following two peptides and two amino acids:
1. Arg
2. Ser
3. Arg, Met, Phe
4. Leu, Lys, Tyr