Fig. 4. Rst is expressed in the apodemes. Double staining of abdominal hemisegments of the Wß1HI-lacZ apodeme specific enhancer trap line shows overlap during stage 14: (A) Rst channel. (B) Overlay of Rst (red) and ß-galactosidase (green). a, anterior; iapo, intersegmental apodemes; p, posterior. Scale bar: 20 µm.