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Signalling by members of the transforming growth factor ß (TGF-ß) superfamily depends on a group of intracellular signalling molecules termed Smads. R-Smads are phosphorylated by the Ser/Thr kinase receptors to which these ligands bind; the R-Smads can then heterodimerize with a Co-Smad, enter the nucleus and regulate gene expression. In Cell Science at a Glance (see p. 3355 + poster), Aristidis Moustakas surveys the Smad signalling network, detailing its cytoplasmic and nuclear aspects, as well as the regulatory mechanisms that operate.
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