what are microfilaments made of

Microfilaments (also called actin filaments) are made primarily of long polymers of the protein actin, arranged as two helical, intertwined strands of actin subunits.

They are built from:

• Globular actin (G‑actin) subunits that assemble end‑to‑end into chains.

• These chains pair up and twist around each other to form filamentous actin (F‑actin), which is the actual microfilament.

• In cells, various accessory proteins can bind to or modify these actin filaments, but the core “material” is polymerized actin.

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