title: The earliest fossil embryos begin to mature.
authors.affiliation: Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK. Neil.Gostling@bristol.ac.uk
authors.forename: Neil J
authors.initials: NJ
authors.lastname: Gostling
authors.forename: Philip C J
authors.initials: PC
authors.lastname: Donoghue
authors.forename: Stefan
authors.initials: S
authors.lastname: Bengtson
mesh_terms: D000818:Animals; D004622:Embryo, Mammalian / Q000648:ultrastructure*; D004625:Embryo, Nonmammalian; D005580:Fossils; D008855:Microscopy, Electron, Scanning