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Fig. 1 cdx4 is expressed in the endoderm during zebrafish pancreas development. (A-B′) Dashed lines in A,B indicate approximate plane of section in A′,B′. Arrow indicates endoderm. (C-J) Locations of expression domains determined by photographing each embryo under brightfield for either pdx1 or cdx4 expression and under fluorescence to reveal myosin expression in the somites. Images were merged (not shown) to determine the AP location of pdx1 or cdx4 expression. (C-F) Dorsal views of pdx1 expression. Brackets indicate somite level. (G-J) Lateral views of cdx4 expression. Bracket indicates somite adjacent to the anterior-most region of the cdx4 domain. To image endodermal cdx4 expression, the paraxial and lateral plate mesoderm were removed. Magnification: 200x in C-J.