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All animals have the ability to move. In most animals, striated muscles move the body and smooth muscles the internal organs. In both muscles, contraction results from interaction between myosin and actin filaments. Based on vertebrate studies, smooth and striated muscles are thought to have different protein components and filament structures. We have studied muscle ultrastructure in the parasite Schistosoma mansoni, where we find that this view is not supported. This invertebrate possessesdoi:10.1073/pnas.ss11242 fatcat:y5zkprq5tbffzisipm56k4p45e