RA signaling regulates irx2a expression during nephrogenesis. (A) WISH analysis at the 28 ss demonstrates alterations in the irx2a pronephros domain after either treatment of RA or DEAB. The black arrowheads show the distance from distal irx2a expression to the cloaca, and the black lines highlight irx2a expression. (B) Quantification of irx2a length (μm) at the 28 ss. Each dot represents one pronephros. (C) Quantification of the length from irx2a expression to the cloaca (μm), where each dot represents one pronephros. For each graph, data is represented +/− SEM and significance was determined with an ANOVA. WISH – whole mount in situ hybridization, ss- somite stage, RA – retinoic acid, DEAB - N,N-diethylaminobenzaldehyde.
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