1. Nygaard, A. P., in Wright, B., ed., Control Mechanisms in Respiration and Fermentation, 27 (Ronald Press Co., New York, 1963). Singer, T. P., Gregolin, C., and Cremona, T., ibid., 47. Nygaard, A. P., in Haematin Enzymes, edit. by Falk, J. E., Lemberg, R., and Morton, R. K., 544 (Pergamon Press, 1961).
2. Morton, R. K., ibid., 233.
3. Nygaard, A. P., J. Biol. Chem., 236, 920, 2128 (1961).
4. Gregolin, C., and Singer, T. P., Biochim. Biophys. Acta, 67, 201 (1963).
5. Chance, B., in Methods of Enzymology, edit. by Colowick, S. P., and Kaplan, N. O., 4, 273 (Academic Press, New York).