title: When did I begin?--a reply to Nicholas Tonti-Filippini.
authors: N
authors: N
authors: Ford
mesh_terms: D033421:Beginning of Human Life; D002410:Catholicism; D004622:Embryo, Mammalian; D047108:Embryonic Development; D005306:Fertilization; D006801:Humans; D028723:Personhood; D010684:Philosophy