Free Extracellular Diffusion Creates the Dpp Morphogen Gradient of the Drosophila Wing Disc: Shaohua Zhou, Wing-Cheong Lo, Jeffrey L. Suhalim, Michelle A. Digman, Enrico Gratton, Qing Nie, Arthur D. Lander. BackgroundHow morphogen gradients form has long been a subject of controversy. The strongest support for the view that morphogens do not simply spread by free diffusion has come from a variety of ....
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