title: Effect of photoperiod on time of blastocyst implantation in the rat.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology*; D010064:Embryo Implantation; D004971:Estrus; D005260:Female; D008027:Light; D011247:Pregnancy; D051381:Rats; D013997:Time Factors