title: Embryologic development and monozygotic twinning.
authors.affiliation: Department of Pediatrics, University of British Columbia, Vancouver, Canada.
authors.forename: J G
authors.initials: JG
authors.lastname: Hall
authors.forename: E
authors.initials: E
authors.lastname: Lopez-Rangel
mesh_terms: D005314:Embryonic and Fetal Development; D006801:Humans; D010920:Placenta; D012744:Sex Ratio; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic