5B, panels g,g). on endoderm to up-regulate Hex, which, in turn, controls production of a diffusible heart-inducing factor. This novel function for Hex suggests an etiology for the cardiac malformations in Hex mutant mice and will make possible the isolation of factors that induce heart directly in the mesoderm. embryos (Marvin et al. 2001; Schneider … Continue reading 5B, panels g,g)