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Microfilament

Solid cytoskeletal structure made of a double-helix polymer of actin.

Also: Actin filament

Actin polymers that mediate cell shape, motility, cytokinesis, and apical brush-border structure in enterocytes.

How one textbook covers it

Advanced Nutrition and Human Metabolism, 8th ed. (Gropper) — Glossary
Actin polymers that mediate cell shape, motility, cytokinesis, and apical brush-border structure in enterocytes.

Cytoskeleton, Microtubules