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Fig. 6 Photomicrographs of the anterior hindbrain region of 20 h embryos hybridised with a probe for krx-20. (A) Control showing krx-20 expressing in r3 and r5. (B,C) Examples of embryos injected with mouse Hoxa-1 RNA at the single cell stage. r5 is normal in both cases but r3 expression of krx-20 is abnormal. The anterior hindbrain appears distorted; thus r3 is split dorsally in B and is laterally displaced in C. Ectopic regions of krx-20 expression, such as that arrowed most anteriorly in C, were occasionally seen. Scale bar, 100 μm.
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