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Figure 6


Fig. 6. en PSEs can mediate both positive and negative signals from many enhancers and silencers. P[en3] is inserted into the capulet transcription unit. β-Gal activity in proventriculus (PV), brain and wing disc (WD) is shown. In the PV, loss of both PSE1 and PSE2 leads to ubiquitous expression of β-gal, whereas in the brain, loss of both PSE1 and PSE2 decreases the expression. PSE2, which is present in {Delta}PSE1, seems to repress transcription in the proventriculus and wing disc, but activates it in the brain.