1. a Chance, B., and Nishimura, M., Proc. U.S. Nat. Acad. Sci., 46, 12 (1960). b Müller, A., and Witt, H. T., Nature, 189, 944 (1961).
2. Witt, H. T., Müller, A., and Rumberg, B., Nature, 191, 194 (1961).
3. Witt, H. T., Müller, A., and Rumberg, B., Angew. Chem., 73, 507 (1961).
4. Vernon, L. P., and Kamen, M. D., Arch. Biochem. Biophys., 51, 122 (1954). Vernon, L. P., and Zaugg, W. S., Biochem., 235, 2728 (1960).
5. Kok, B., Acta Botan. Neerl., 6, 316 (1957). Kok, B., and Hoch, G., Light and Life, 397, ed. by McElroy and Glass (Johns Hopkins Press, 1961).