The amino acid sequence of an unknown peptide can be determined using a series of proteolytic digestions. An eight-mer peptide contains 1 alanine (ALA), 2 arginines (ARG), 1 methionine (MET), 1 serine (SER), 1 tyrosine (TYR) and 2 valines (VAL) with ALA at the N-terminus and VAL at the C-terminus. This peptide was digested with trypsin (cleaves the peptide bond C-terminus to a LYS or ARG) and chymotrypsin (cleaves th