Overview of pcdh18 expression in zebrafish embryos. Panels show extended depth of field photographs (see Experimental Procedures) of embryos stained blue by in situ hybridization for pcdh18 transcripts. Orange numbers indicate hours post-fertilization. Black arrows indicate the germ ring. Black arrowheads indicate the shield. Thin white bars show the triangular area of expression in 9 hpf embryos. Open arrows indicate punctuate expression in the head and trunk. The animal pole is aligned toward the top in lateral, dorsal, and ventral views. Dorsal is to the right in lateral views and down in animal pole views. Abbreviations: G, gills; MHB, midbrain-hindbrain boundary; PA, pharyngeal arch primordia or arches; PF, pectoral fin.
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