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Signaling through scaffold, anchoring, and adaptor proteins. Protein modules for the assembly of signaling complexes. Modular domains recognizing specific sequences on their target acceptor protein are depicted.. Mechanisms for recruiting/localizing signal transduction complexes. (A) Assembly of modular signaling mole-cules on an activated receptor tyrosine kinase. (B) A localized signaling complex of three anchored signaling enzymes. Bound enzyme is usually inactive; in response to the appropriate signal, the enzyme is activated..
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