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Fig. 3. fos-1 loss-of-function causes abnormal uterine morphology and
absence of uterine egl-13 expression. (A) Specification
and mid L4 stage expression of egl-13::GFP(tyIs4) in the wild type
and fos-1(ar105). fos-1(ar105) do not express GFP in uterine tissue
(dashed ovals indicate where fluorescence was expected; fluorescent 
nuclei in the wild type are bracketed). The mid L4 stage uterus in
ar105 is undifferentiated by comparison with the wild type, as
apparent by the absence of a uterine lumen. Arrow indicates the utse, observed
only in the wild type. Other GFP-positive cell bodies belong to the body wall,
where fluorescence is not affected. (B) No uterine egl-13::GFP
expression or lumen is observed after fos-1 RNAi treatment. Scale
bar: 10 µm.
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