Figure 1From: A cleavage clock regulates features of lineage-specific differentiation in the development of a basal branching metazoan, the ctenophore Mnemiopsis leidyiCtenophore development and cell lineage. Ctenophore body plan, with (A) lateral view, aboral pole up and (B) aboral view. The comb plates are shown in yellow to indicate the contribution from e1 micromeres (yellow) and m1 micromeres (pink). The photocytes, are a derivative of the 2Â M cells and associated with the endodermal canals underlying the comb rows[4, 16]. (C) Simplified cell lineage fate map showing the e1, m1, 1E/ and 1Â M/ micromere sublineages. For each of the different early cleavage stages there are diagrams showing the embryo from the aboral pole. Modified after[1, 4, 14].Back to article page