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Fig. 1. Early restriction of developmental fates in the ascidian embryo. (A) Cell
lineage of blastomeres during early embryogenesis. Because the embryo is
bilaterally symmetrical, only the left half of the embryo is shown. Thick and
colored lines indicate blastomeres whose developmental fate becomes restricted
to one tissue. This is based mainly on data obtained in Halocynthia
by Nishida (Nishida, 1987 ).
(B) Schematic representations of the ascidian embryo. Blastomeres whose
developmental fate is restricted to one tissue are in color: yellow, endoderm;
orange, mesenchyme; light blue, muscle; dark blue, notochord; green,
epidermis; pink, nerve cord; red, nervous system. The blastomeres marked with
asterisks give rise to muscle and trunk ventral cells.
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) and signaling genes (E,
Dickkopf; F, Wnt5). Scale bar: 100 µm.
