1. Myers, D. E., in The Enzymes (edit. by Boyer, P. D., Lardy, H., and Myrbäck, K.,) 4, 475 (Academic Press, New York, 1960).
2. Hunter, R. L., and Markert, C. L., Science, 125, 1294 (1957). Markert, C. L., and Hunter, R. L., J. Histochem. Cytochem., 7, 42 (1959).
3. Ecobichon, D. J., and Kalow, W., Canad. J. Biochem. Physiol., 41, 753 (1962); ibid., 42, 277 (1964).
4. Eränko, O., Kokko, A., and Söderholm, U., Nature, 193, 778 (1962); ibid., Ann. Med. Exp. Biol. Fenn., 40, 146 (1962).
5. Barron, K., Bernsohn, J., and Hess, A., J. Histochem. Cytochem., 9, 656 (1961).