The amino-acid sequence in the phenylalanyl chain of insulin. 1. The identification of lower peptides from partial hydrolysates

Ala, Leu] refers to a peptide or peptides containing glycine, alanine and leucine, in which the free amino group is on the glycine residue, but the relative order of the alanine and leucine residues is unknown. The residues having the free a-amino groups in peptides will be referred to as N-terminal residues, those with free oc-carboxyl groups as C-terminal residues.