Generalised expression in early embryos which becomes more restricted as development progresses. The pattern is first observed at 14 cells in the AB lineage, Ea/Ep and MSa/MSp. The germline and C/D lineages never stain and by 210 minutes the expression becomes restricted to what appears to be the AB lineage, particularly regions of the hypodermal cells. The pattern has not been observed after 430 minutes.
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.