1. Beavon, J. M. (1963). J. med. Lab. Tech., 20, 183.
2. Bennett, M. C., and Chanarin, 1. (1961). Lancet, 2, 1095.
3. , (1962). Nature (Lond.), 196, 271.
4. Bergmann, F., and Dikstein, I. (1958). Meth. biochem. Anal., 6, p. 88.
5. Booth, A. N., Emerson, 0. H., Jones, F. T., and DeEds, F. (1957). J. biol. Chem., 229, 51.