title: A problematic principle.
authors.affiliation: Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, V5A1S6, Canada. dlaforce@sfu.ca
authors.forename: Lyle
authors.initials: L
authors.lastname: Crawford
authors.forename: Daisy
authors.initials: D
authors.lastname: Laforce
authors.forename: Zubin
authors.initials: Z
authors.lastname: Master
mesh_terms: D000818:Animals; D002678:Chimera; D033041:Embryo Research / Q000941:ethics*; D053595:Embryonic Stem Cells; D006801:Humans; D039904:Pluripotent Stem Cells