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Rouxs Arch Dev Biol
1993 Apr 01;2024:233-239. doi: 10.1007/BF02427884.
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The possible role of mesodermal growth factors in the formation of endoderm inXenopus laevis.
Jones EA
,
Abel MH
,
Woodland HR
.
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We have raised a monoclonal antibody, 4G6, against gut manually isolated from stage 42Xenopus laevis embryos. It is specific for endoderm and recognises an epitope that is first expressed at stage 19 and which persists throughout subsequent development. The antibody maintains gut specificity through metamorphosis and into adulthood. The epitope is conserved in the mouse, where it is also found in the gut. Isolated vegetal poles fromXenopus blastula stage embryos express the epitope autonomously after culturing to the appropriate stage. This shows that certain aspects of endoderm differentiation do not require germ layer interactions. Animal cap cells from stage 9 blastulae cultured in the presence of the mesodermal growth factors FGF, XTC-MIF and PIF form both endodermal and mesodermal tissues, assessed by the binding of tissue-specific monoclonal antibodies. Endoderm is typically found in those caps which form intermediate and ventral forms of mesoderm, that is muscle and lateral plate.
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