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ActA stimulation of Arp2/3 complex-mediated actin polymerization. Fluorescence intensity is plotted as a function of time in pyrene-actin polymerization assays. 1, actin; 2, actin and Arp2/3 complex; 3, actin and ActA (amino acids 29 to 263); 4, actin, Arp2/3 complex, and ActA (amino acids 29 to 263). (Reprinted from reference 187 with permission of the publisher.)
