title: The timing of monozygotic twinning: a pro-life challenge to conventional scientific wisdom.
abstract: A recent paper in Zygote criticizes the 'theory of origins' of the various classes of monozygotic twins originally proposed and developed by Corner. It does so on the basis of recent observations on human IVF embryos. Here, the validity of one of the evidential sources is upheld, but an alternative explanation is proposed that is more plausibly based on evidence than the explanation offered in Zygote.
authors.affiliation: Centre for Immunology and Infection, University of York, Heslington, York, YO10 5DD, UK. Electronic address: gardner750@btinternet.com.
authors.forename: R L
authors.initials: RL
authors.lastname: Gardner
mesh_terms: D005307:Fertilization in Vitro / Q000941:ethics*; D006801:Humans; D038522:Twinning, Monozygotic
keywords: IVF; Vatican; human embryo; monozygotic twins