noun[mass noun] Biochemistry
A globular protein complex involved in muscle contraction. It occurs with tropomyosin in the thin filaments of muscle tissue.
- Actin, myosin, and troponin and tropomyosin were isolated from rabbit back muscle.
- The tropomyosin and troponin proteins on the actin filament provide the switch.
- The addition of regulatory proteins, troponin and tropomyosin, is known to increase the sliding speed of thin filaments in the in vitro motility assay.
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