1. Ogawa, T. & Okazaki, T. A. Rev. Biochem. 49, 421–457 (1980).
2. Rich, A. Proc. natn. Acad. Sci. U.S.A. 46, 1044–1053 (1960).
3. Arnott, S., Smith, P. J. C. & Chandrasekaran, R. CRC Handbk Biochem. molec. Biol. 3rd edn, Vol. 2 (ed. Fasman, G. D.) (CRC, Cleveland, 1976).
4. van Boeckel, C. A. A. et al. Reel Trav. chim. Pays-Bus Belg. 100, 389–390 (1981).
5. Hendrickson, W. A. & Konnert, J. Biomolecular Structure, Conformation, Function and Evolution Vol. 1 (ed. Srinvasan, R.) 43–57 (Pergamon, Oxford, 1979).