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Actin filaments of chick heart fibroblasts stained with rhodamine phalloidin (Cat. no. R415). The subcompartments in the cytoskeleton are readily apparent and labeled as follows: sf, stress fiber; lam, lamellipodium; fil/ms, filipodium/microspike; am, actin meshwork; arc, dorsal arc. Figure reprinted from "Visualizing the Actin Cytoskeleton." J. Small et al. Microscopy Research and Technique 47, 3–17 (1999). Reprinted by permission of Wiley-Liss, Inc., a subsidiary of John Wiley & Sons, Inc., and J. Victor Small.