Cells keep their shape with actin filaments (red) and microtubules (green)

James J. Faust and David G. Capco, Arizona State University

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Cells keep their shape with actin filaments and microtubules 

This image shows a normal fibroblast, a type of cell that is common in connective tissue and frequently studied in research labs. Unlike the spiky version, this cell has a healthy skeleton composed of actin (red) and microtubules (green). Actin fibers act like muscles to create tension and microtubules act like bones to withstand compression.

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