upon reduction and alkylation , with subsequent separation of peptides by gel filtration , three components were obtained : the largest component ( molecular weight 13,400 ) corresponded to the n-terminal segment of j chain and contained a homoserine residue , the second corresponded to the c-terminal part of j chain with 13-18 amino acid residues , and the third corresponded to the c-terminal octapeptide of the alpha chain .
C0019892
homoserine
C0002520
amino acid