Figure 1.

Nvnotch and Nvdelta embryonic expression. Expression of Nvdelta(A,B) and Nvnotch(C,D) is shown at early gastrula (A,C) and late gastrula (B,D) stages. Nvdelta is expressed in a “salt and pepper” expression pattern at early gastrula (A), and ubiquitously expressed at late gastrula (B), though there are cells enriched for Nvdelta in the late gastrula (B, arrows). Clusters of cells distributed in a “salt and pepper” pattern express Nvnotch in the early gastrula stages (C). By late gastrula, Nvnotch appears to have low-level ubiquitous expression (D). Images are lateral views taken from a superficial focal plane; oral is to the left.