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U.S.A."],"published-print":{"date-parts":[[2019,10,8]]},"abstract":"Significance<\/jats:title>\n \n The unicellular apicomplexan parasite,\n Plasmodium falciparum<\/jats:italic>\n , causes malaria in humans that results in >400,000 deaths per year. The parasite must produce force and motion to progress through its lifecycle and cause disease. The core of the macromolecular complex that powers invasion and motile stages consists of a unique single-headed myosin and a divergent actin (\n Pf<\/jats:italic>\n Act1). We used total internal reflection fluorescence microscopy to visualize polymerization of individual\n Pf<\/jats:italic>\n Act1 filaments in real time in the absence of stabilizing agents. 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