Individuality and Human Beginnings: A Reply to David DeGrazia

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The author argues that individuality does not require indivisibility and that twinning can be explained as the reprogramming of blastomeres that already have begun to differentiate in accordance with the needs of the unified organism that originates at conception.

Document Type: Research Article


Affiliations: Ryan Professor of Metaphysics and Moral Philosophy at Georgetown University and currently serves on the U.S. President's Council on Bioethics.

Publication date: September 1, 2007

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