1. The amino acids used, with the exception of glycine, have the L-configuration. Symbols and abbreviations are in accordance with the recommendations of the IUPAC-IUB Commission on Biochemical Nomenclature, Biochemistry11, 1726 (1972).
2. A. Anastasi, P. Montecucchi, F. Angelucci, V. Erspamer and R. Endean, Experientia, in press (1977).
3. W. König, and R. Geiger, Chem. Ber.103, 788 (1970).
4. T. Fujii, T. Kimura and S. Sakakibara, Bull. chem. Soc. Japan49, 1595 (1976)
5. Paper electrophoretic mobilities in HCOOH/CH3COOH/H2O (615∶500∶3885) and in CH3COOH/pyridine/H2O (50∶450∶4500), respectively, with histidine as standard.