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3. J. E. Folk and J. S. Finlayson, “Advances in Protein Chemistry,” Vol. 31, ed. by C. B. Anfinsen, J. T. Edsall and F. M. Richards, Academic Press Inc., New York, N. Y., 1977, p. 1.
4. K. Sugawara, “Biochemistry of Cutaneous Epidermal Differentiation,” ed. by M. Seiji and I A. Bernstein, University of Tokyo Press, Tokyo, 1977, p. 387.
5. A. G. Matoltsy, “Biology of Skin and Hair Growth,” ed. by A. G. Lyne and B. F. Short, Angus and Robertson, Sidney, 1965, p. 291.