title: Structural changes in the corpus luteum and endometrium of seals before implantation.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology / Q000648:ultrastructure; D010872:Caniformia / Q000033:anatomy & histology*; D003338:Corpus Luteum / Q000648:ultrastructure*; D010065:Embryo Implantation, Delayed; D047108:Embryonic Development; D004717:Endometrium / Q000648:ultrastructure*; D005260:Female; D008854:Microscopy, Electron; D011247:Pregnancy; D046048:Seals, Earless / Q000033:anatomy & histology* / Q000502:physiology