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Fig. 6. Different levels of Brk activate Dll and dac.
(A-B'') brk-; tub>brk+ clones
(lacZ, green) grown at different temperatures. (A) At 25°C, the
levels of Brk are sufficient to prevent both Dll and dac
derepression (arrow). Compare with the brk- clone in
Fig. 2B, where both
Dll and dac are derepressed. (B) At 17°C the levels of
Brk are sufficient to prevent Dll derepression but not dac
derepression (arrow). Approximately half of the clones examined with this
genotype showed dac, but not Dll, derepression like the
clone shown here, a phenotype that was never observed in
brk- clones. The other (approximately) half of these
clones failed to derepress either Dll or dac. The '
and '' panels show the single Dll or Dac expression patterns,
respectively.
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