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Fig. 1. Expression patterns of pnr and ush in stage 11 embryos. (A-C) Confocal optical section (2 µm) through the mesoderm of two abdominal segments double labeled for Mef2 (A,C) protein and pnr RNA (B,C). Note that pnr RNA is present at high levels in the cardiac mesoderm surrounding Mef2 labeled nuclei. (D) A wild-type embryo cross-section showing the relative patterns of tin, pnr, ush and dpp expression.