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. 2018 May 1;16:43. doi: 10.1186/s12958-018-0359-5

Fig. 4.

Fig. 4

Role of PGE2 in embryo development. PGE2 is secreted by the embryo, from the 2-cell embryo to the blastocyst stage. The level of PGE2 increases gradually in the embryo pre-implantation. PGE2 secreted by the embryo, ovary, corpus luteum, oviduct and endometrium stimulate cleavage, survival, and blastocyst formation and hatching rates in the intrauterine cavity