1. Chance, B. and Graham, N. (1971) Rev. Sci. Inst. 42, 941.
2. Oshino, N., Sugano, T., Oshino, R. and Chance, B. (1974) Biochem. Biophys. Acta. 368, 298.
3. Safer, B. and Williamson, J.R. (1973) J. Biol. Chem. 248, 2570.
4. Tamura, M., Oshino, N., Chance, B. and Silver, I. Biochem. J. (in press)