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Fig. 3 Early pattern of islet1 and lim3 expression in the neural keel. Dorsal views of neural-keel-stage embryos. At this stage, nascent primary motoneurons form bilateral, discontinuous columns separated by the floorplate (fp). Note that expression patterns are not bilaterally symmetric. (A) Dorsal view of 3-somite-stage embryo probed for islet1 RNA. (B) Dorsal view of 5-somite-stage embryo probed for lim3 RNA. Dotted lines mark approximate somite boundaries. Numbers indicate somite level. Scale bar equals 20 μm.
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