Expr13282
The knockin strain shows significant Msx/vab-15 expression in embryonic AB.p(lr)apapaa, which is the mother cell of Q and V5 neuroblasts. After the division of this mother cell, Msx/vab-15 expression turns off in V5 neuroblasts but is maintained in Q cells until they divide. P-neuroblast expression of Msx/vab-15 starts before hatching, is maintained while P nuclei migrate into the ventral midline in early L1-stage larvae, and shuts down after P neuroblasts divide.