1. Acheson, R. M., Paul, R. M., and Tomlinson, R. V. (1958). Canad. J. Biochem., 36, 295.
2. Bakerman, H. A., Silverman, M., and Daft, F. S. (1951). J. biol. Chem., 188, 117.
3. Baldridge, R. C. (1958). Ibid., 231, 207.
4. Bennett, M. C., and Chanarin, I. (1962). Nature (Lond.), 196, 271.
5. Borek, B. A., and Waelsch, H. (1953), J. biol. Chem., 205, 459.