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Cdc42 signaling pathways play important roles in immune cell polarization and cytoskeletal changes. Although the small Cdc42-binding proteins SPEC1 and SPEC2 play a role in F-actin accumulation in activated T lymphocytes, little is known about their precise activities in other cell types. Here, we mapped the Cdc42-binding activity of SPEC1 to the CRIB sequence and a downstream alpha helical region...
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