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Actin filaments
Actin filaments (shown in red) inside a fibroblast - a type of cell found commonly in connective tissue. Inside cells, actin fibers act like muscles to create tension, while so-called microtubules (shown in green) act like bones to withstand compression. Credit: James J. Faust and David G. Capco, Arizona State University/US National Institute of General Medical Sciences.
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