a, Upper panel, lateral view of a stage 23 embryo electroporated with Msx>H2B∷mCherry (magenta nuclei) and Neurogenin (Neurog) b-line>unc-76∷eGFP (green) and Msx>nls∷lacZ, serving as the wild-type “control” condition. Lower panel, embryo electroporated with same reporters as upper panel, plus Msx>Su(H)-DBM, which encodes a DNA-binding mutant form of the Notch co-activator Rbpj. No discernable difference in Neurog activation or bipolar tail neuron (BTN) specification was observed between control and Su(H)-DBM conditions (1/32 vs. 2/42 embryos showing ectopic Neurog+ BTNs, respectively). b, Late overexpression of Su(H)-DBM using the Neurog b-line driver similarly did not alter BTN specification/differentiation, as monitored by Asic>unc-76∷eGFP reporter expression (0/50 control vs. 0/50 Su(H)-DBM embryos showed ectopic Asic+ BTNs). All scale bars 50 μm.