1. John M. Thorp, Steven R. Wells, Watson A. Bowes & Robert C. Cefalo (1995). Integrity, Abortion, and the Pro‐Life Perinatologist. Hastings Center Report 25 (1):27-28.
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  2. Robert C. Cefalo (1991). Eggs, Embryos, and Ethics. Hastings Center Report 21 (5):41-41.
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  3. Robert C. Cefalo (1989). The Zygote: To Be or Not Be a Person. Journal of Medicine and Philosophy 14 (6):641-645.
    It is no longer possible to claim that the biological characteristics of the future adult are already determined at conception. After all, a zygote may develop into a hydatidiform mole rather than into a human being. The development of an individual human person is determined by genetically and nongenetically coded molecules within the embryo, together with the influence of the maternal environment. Consequently, it is an error to regard the zygote's chromosomal (and other) DNA as sufficient to determine the uniqueness (...)
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