Figure 4.

Role of trxG proteins in the absence of embryonic transcriptional activation. (A) Effects of heterozygous trx^E2 and brm² mutant backgrounds on mini-white expression in two lines carrying Ab-Fab (Ab14) or ΔZ-Fab (ΔZ14) transgenes. Male eyes are shown. (B) Immuno-FISH with anti-TRX and anti-BRM antibodies, of polytene chromosomes from Ab14 and ΔZ14 lines without GAL4 driver. Cytological landmarks and the position of the transgene are indicated as in Figure 1B. (C) Top: effect of a homozygous z^a mutant background on Ab-Fab-mediated mini-white expression in the Ab14 line. Bottom: immuno-FISH of Zeste in the Ab14 and ΔZ14 lines.