1. a protein found in muscle cells that interacts with myosin to produce muscle contraction
Usage: biology, biochemistry
2. a protein present in most eukaryotic cells that forms part of the cytoskeleton and is involved in cell movement and shape
Usage: cell biology

Examples

• Actin and myosin are the two main proteins responsible for muscle contraction.
• The sliding filament theory explains how actin and myosin interact during muscle movement.
• Actin filaments help maintain the cell's structure and enable cell division.
• Researchers studied how actin polymerization affects cell migration.
• The cytoskeleton contains actin, microtubules, and intermediate filaments.