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Relationship of ephrin-B2, EphA4, and the bHLH transcription factor her1 expression in the anterior presomitic mesoderm and posterior somites. Shown here are dorsal views of in situ hybridization analyses of six-somite-stage zebrafish embryos stained with digoxigenin- and fluorescein-labeled antisense RNA probes to EphA4 (left and center panels in purple-brown), ephrin-B2 (left panel in red-brown, right panel in purple-brown), and her1 (center and right panels in red-brown). (For details, see Durbin et al., p. 3096.)