title: Biological characteristics of the preembryo.
authors.affiliation: University of California, San Diego, La Jolla 92093.
authors.forename: C
authors.initials: C
authors.lastname: Grobstein
mesh_terms: D001755:Blastocyst / Q000166:cytology / Q000502:physiology; D004622:Embryo, Mammalian / Q000502:physiology*; D005260:Female; D006801:Humans; D009028:Morula / Q000166:cytology / Q000502:physiology; D015053:Zygote / Q000166:cytology / Q000502:physiology