1. Ramachandran, G. N., and Kartha, G., Nature, 176, 593 (1955).
2. Cohen, C., and Bear, R. S., J. Amer. Chem. Soc., 75, 2783 (1953). Cowan, P. M., North, A. C. T., and Randall, J. T., in “The Nature and Structure of Collagen” (Butterworth, London, 1953); and in “Fibrous Proteins and Their Biological Significance”, Soc. Exp. Biol. Symp., 9 (Camb. Univ. Press, 1955). Bear, R. S., ibid.
3. Schroeder, W. A., Kay, L. M., Le Gette, J., Hounen, L., and Green, F. C., J. Amer. Chem. Soc., 76, 3556 (1954). Kroner, T. D., Tabroff, W., and McGarr, J. J., J. Amer. Chem. Soc., 77, 3356 (1955).
4. Personal communication. Also communicated at the 3rd International Congress of Biochemistry, Brussels, 1955.
5. Cowan, P. M., and McGavin, S., Nature, 176, 501 (1955).