• Complex (T,I,C) which mediates actin-myosin contractile phenomena; troponin C, when saturated with calcium, permits myosin to displace tropomyosin from actin filaments.
  CRISP Thesaurus
  National Institutes of Health, 2006
• One of the minor protein components of skeletal and cardiac muscles. It functions as the calcium-binding component in a complex with BETA-TROPOMYOSIN; ACTIN; and MYOSIN and confers calcium sensitivity to the cross-linked actin and myosin filaments. Troponin itself is a complex of three regulatory proteins (TROPONIN C; TROPONIN I; and TROPONIN T).
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• Proteins found in heart muscle that leak into the circulation during a heart attack or other heart injury.
  Harvard Dictionary of Health Terms
  Harvard Medical Publishing, 2011
• Troponins are protein molecules that are part of cardiac and skeletal muscle. Smooth muscle cells do not contain troponins.
  Medscape
  WebMD, 2025