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Max Planck Institute for Molecular Cell Biology and Genetics, Pfotenhauerstrasse 110, D-01307 Dresden, Germany. Simons@EMBL-Heidelberg.de
Signal transduction is initiated by complex protein-protein interactions between ligands, receptors and kinases, to name only a few. It is now becoming clear that lipid micro-environments on the cell surface -- known as lipid rafts -- also take part in this process. Lipid rafts containing a given set of proteins can change their size and composition in response to intra- or extracellular stimuli. This favours specific protein-protein interactions, resulting in the activation of signalling cascades.
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