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Fig. S1. Neural induction occurs in the absence of the mesoderm. In situ hybridization demonstrates that the mesodermal markers Chordin and MyoD were not turned on in embryos injected with tActRIIB, Smad7 or Ski, though these molecules could induce neural marker expression in ventral ectoderm of frog neurulae. Image published in: Chang C and Harland RM (2007) Copyright © 2007. Image reproduced with permission of the publisher and the copyright holder. This is an Open Access article distributed under the terms of the Creative Commons Attribution License. Larger Image Printer Friendly View

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