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Effect of ghrelin addition on early embryonic development in sheep. (A) Diagram of fertilization and early embryonic development in vitro. (B) Cell morphology during fertilization and early embryonic development in vitro. I. Fertilization, II. Fertilization finish, III. 2 cell, IV. 4 cell, V. 8 cell, VI. 16 cell, VII. Morula, VIII. Blastocyst. Scale bar: 20 μm.
