1. M. Bergmann, A classification of proteolytic enzymes, Advan. Enzymol.
2:49–68 (1942).
2. B. Shome and M. Saffran, Peptides of the hypothalamus, J. Neurochem.
13:433–448 (1966).
3. S. Lande, A. B. Lerner, and V. G. Upton, Pituitary peptides. Isolation of new peptides related to β-melanocyte-stimulating hormone, J. Biol. Chem.
240:4259–4263 (1965).
4. Enzyme Nomenclature, Elsevier, Amsterdam (1965).
5. G. Gomori, Chromogenic substrates for amino peptidases, Proc. Soc. Exptl. Biol. Med.
87:559–561 (1954).