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Fig. 3
Expression patterns of the zebrafish prrx1a and prrx1b genes. A–G:prrx1a expression from 14 to 48 hpf. The asterisk denotes expression in the tail bud, the arrowhead in the LPM first and pectoral fins later, the arrow in the head mesenchyme first and branchial arches later and the double-arrowhead in the ventral part of the somites. H–L:prrx1b expression from 18 to 48 hours postfertilization (hpf). The asterisk denotes pronephric ducts, the arrowhead pectoral fins and the arrows expression in the branchial arches. All the embryos are oriented with anterior to the right. Lateral views are shown for the images at the left whereas dorsal ones are presented in middle or right images.