Numbers of descendant cells derived from precursor blastomeres of various tissues.

<p>(A) Vegetal view of 64-cell embryos color-coded for precursor blastomeres of each tissue. Anterior is up. Names of blastomeres and numbers of descendants cells derived from each are shown. Blue bars connect sister blastomeres on the left half of the embryo. Images showing the descendant cells are reproduced from Nishida (1987) <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0090188#pone.0090188-Nishida1" target="_blank">[2]</a>. (B) Mechanism of asymmetric cell divisions that is induced by FGF signaling in the anterior and posterior parts of embryos, respectively. Mch, mesenchyme. Mus, muscle. Not, notochord. NC, nerve cord.