Larger Image Fig. 4. Localization of XAA1 expression. Embryo stages are shown on the lower left of each panel. Panels A–H illustrate colorimetric in situs, and panels K and N FCIS with a Na+K+ATPase counterstain. XAA1 is strongly expressed in the late proximal segment from stages 32 onwards. Very low-level expression is also observed in the distal tubule and pronephric duct at stage 38. Image published in: Zhou X and Vize PD (2004) Copyright © 2004. Image reproduced with permission of the Publisher, Elsevier B. V.
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