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Fig. 2

Gene expression analysis of late gastrula embryos reveals distinct ventroposterior and dorsoanterior territories.

(a) Whole-mount in situ hybridization analysis for various mesodermal markers as indicated. Embryos were flat-mounted and are orientated with the animal side at the top and vegetal side at the bottom. Only mesodermal expression is highlighted with the exception of bmp4, which is expressed in the epiblast (expression in the hypoblast is unknown). (b) Schematic representation of the late gastrula mesodermal subdivisions. ALM, anterior lateral mesoderm; PPM, posterior paraxial mesoderm. Scale bar, 200 µm.

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