Trophoblast differentiates at _ post-fertilization day?: (A) 8-Jun, (B) 12-Aug, (C) 14-Dec, (D) 16-18
Answer is A. Ans. a. 6-8 Explanation: Trophoblast differentiates into cyto and syncytiotrophoblast at 6 - 8th-day post ovulation/fertilization. The references are from Gray's anatomy, Langman Embryology, and Moore Embryology.