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Rap1 is rapidly and transiently activated in response to chemoattractant stimulation and helps establish cell polarity by locally modulating cytoskeletons. Here, we investigated the mechanisms by which Rap1 controls actin cytoskeletal reorganization in Dictyostelium and found that Rap1 interacts with RacGEF1 in vitro and stimulates F-actin polymerization at the sites where Rap1 is activated upon chemoattractant...
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