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Fig. 4 Expression of plxnb2b in 24 hours postfertilization (hpf) to 4 days postfertilization (dpf) zebrafish embryos by whole-mount in situ hybridization. A-D: Lateral views. E-H: Dorsal views. I: Lateral view of a 3 dpf embryo. J-U: Transverse sections of J-O at 2 dpf and P-U at 3 dpf whole-mount samples. V,X: Sagittal sections of 2 dpf (V) and 3 dpf (X) whole-mount samples. Y: No staining was seen with the control sense probe. Allg, anterior lateral line ganglion; Ce, cerebellum; Cm, cranial mesenchyme; Eth, ethmoid plate; Fg, facial ganglion; Mhb, midbrain-hindbrain boundary; Mo, medulla oblongata; N, notochord; Ob, olfactory bulb; Ov, otic vesicle; P, pallium; Pa, pharyngeal arches; Pd, pronephric duct; Pf, pectoral fin; Pha, pharynx; RhV, rhombencephalic ventricle; S, somite; So, neuromasts of the supraorbital lateral line; TeV, telencephalic ventricle; Th, thalamus; Vg, vagal ganglion. Scale bars = 100 μm in J-X.