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Fig. 7. Altered Slou expression in Poxm mutants or in the presence of
ectopic Poxm. Slou expression in wild-type (A,C,E),
PoxmR361 (B,D), and
24BGal4/UAS-Poxm (F) embryos at stage 12 (A,B), 14 (C,D) and
16 (E,F) was visualized by staining with an anti-Slou antiserum. Ventrolateral
views of whole embryos (C,D) and enlarged ventrolateral (A,B) and dorsolateral
(E,F) views of parasegments 4-10 (A,B) and 6-7 (E,F) are shown with anterior
to the left and dorsal up. At late stage 12, Slou is expressed in three
groups, I-III, of muscle founder cells of each abdominal segment of wild-type
embryos (A), whereas it is expressed only in groups I and II of
PoxmR361 mutants (B). At stage 14, Slou is expressed in
the precursors of dorsal muscle DT1 and of ventral muscles VT1 and VA2 of each
abdominal segment of wild-type embryos (C), whereas it is detectable only in
the precursor of ventral muscle VT1, but not of muscles DT1 and VA2, in
PoxmR361 embryos (D). After ectopic expression of Poxm,
additional muscles express Slou (arrows in F) in a dorsolateral region where
Slou is expressed only in muscle DT1 of stage 16 wild-type embryos (E).
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