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Expression of kuz mRNA in the embryonic nervous system. Three segments of the embryonic CNS from a stage 15 Drosophila embryo are shown. The CNS axon tracts are stained brown with mAb BP102, while kuz mRNA appears purple. kuz appears to be expressed in all neurons at a uniform level. This expression remains constant through the axon extension period. The large white arrow marks the midline and the small black arrows mark the lateral borders of the CNS. (Bar = 20 μm.)
