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Fig. 3. Opa is required for Runt-dependent activation. Expression of slp1
mRNA in embryos that are wild-type for runt (A,B), or that have high
levels of NGT-driven Runt (D,E). Ectopic Runt in these embryos was
obtained by crossing females heterozygous for both NGT40 and
NGTA to homozygous UAS-Runt[232] males. The embryos in A and
D are wild type for opa, whereas the embryos in B and E are
homozygous for the opa[1] mutation. (C) Schematic interpretation of
the response of slp1 to the loss of Opa in an embryo with normal Runt
expression. (F) Schematic interpretation of the effects of loss of Opa in an
embryo with uniform Runt expression.