1. Ayer, J.P., Hass, G.M., and Philpott, D.E. (1958). AMA Arch. Pathol. 65, 519.
2. Bensusan, H.B., and Nielsen, S.O. (1964). Biochemistry 3, 1367.
3. Grant, M.E., Steven, F.S., Jackson, D.S., and Sandberg, L.B. (1971). Biochem. J. 121, 197.
4. John, R., and Thomas, J. (1972). Biochem. J. 127, 261.
5. Kramsch, D., Franzblau, C., and Hollander, W. (1970). J. Clin. Invest. 50, 1666.