1. Ramsey, P. The Patient as Person, 239–275 (Yale University Press, New Haven, Connecticut, 1970).
2. World Medical Association Declaration of Helsinki revised edn (1975); repr. in Contemporary Issues in Bioethics (eds Beauchamp, T. L. & Walters, L.) 511–512 (Wads-worth, Belmont, California, 1982).
3. Federal Register 50, 33463 (1985); repr. in Recomb. DNA tech. Bull. 8, 116–122 (1985).
4. Davis, B. D. Science. 170, 1279–1283 (1970).
5. Friedmann, T. & Roblin, R. Science. 175, 949–955 (1972).