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Figure 2. Developmental patterns and cell lineage differentiation from the blastocyst stage (A) through implantation (B) to pre-gastrulation (F) in primate embryos. ICM: Inner cell mass; Epi: epiblast; Hypo: hypoblast; AM: Amnion; VE: visceral endoderm; YE: Yolk sac endoderm; pYS: primary yolk sac; Exmes: extraembryonic mesenchymal cells; sYS: secondary yolk sac; CS: connecting stalk; ChC: chorionic cavity. Image created by Adobe Illustrator.