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1THE CHILDREN'S CANCER RESEARCH FOUNDATION, BOSTON
2HARVARD MEDICAL SCHOOL, BOSTON
*
This is Polypeptides XXVI. For the preceding paper in this series see Bird, G. R., and E. R. Blout, J. Am. Chem. Soc., 81, 2499 (1959). (Alternate address of E. R. Blout, Chemical Research Laboratory, Polaroid Corporation, Cambridge 39, Massachusetts.)
†
This work has been supported in part by U. S. Public Health Service.