Expr12

Embryonic expression consisting of three components. 1. A subset of cells in the AB lineage, initially organized in two clusters, from when the AB lineage is dividing to give 32 cells until the lineage forms 128 cells. Descendants of AB.alpa, AB.alpp, AB.araa, AB.plaa, AB.plpa, AB.praa, AB.prpa. 2. Members of the D cell lineage, starting as Da/Dp divide and ending once 16 cells have been generated in this lineage. 3. Z1 and Z4, from the end of their migration to the germ line progenitors, until shortly after hatching.