At embryonic day 7.0 in mouse embryos, BMP4 and BMP8b are secreted from the extraembryonic ectoderm. In response to these factors a small population of cells at the posterior/caudal end of the embryo will _____. Finish the sentence with the best answer.
A. express Blimp1 and become oocytes
B. express Fragilis, Blimp1 and Stella and become primordial germ cells
C. express Fragilis, Blimp1 and Stella and become spermatozoa
D. express retinoic acid and undergo meiosis.
