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[troh-puh-nin, trop-uh-] /ˈtroʊ pə nɪn, ˈtrɒp ə-/
noun, Biochemistry.
a protein of muscle tissue that binds calcium ions and is involved in contraction.
Origin of troponin
1965-70; tropo(myosin) (see tropo-, myosin) + -n- (of uncertain origin) + -in2

troponin I

[troh-puh-nin ahy, trop-uh-] /ˈtroʊ pə nɪn ˈaɪ, ˈtrɒp ə-/
noun, Biochemistry.
a protein within a troponin complex that helps regulate the heartbeat and can be used as an indicator of myocardial infarction. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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troponin in Medicine

troponin tro·po·nin (trō'pə-nĭn, trŏp'ə-)
A calcium-regulated protein in muscle tissue occurring in three subunits with tropomyosin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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troponin in Science
  (trō'pə-nĭn, trŏp'ə-)   
One of the proteins that make up the thin filaments of muscle tissue and that regulate muscle contraction and relaxation. Troponin occurs in three forms bound together in a complex. One of the three forms is a receptor of calcium ions that induces structural changes that allow the actin in the thin filaments to interact with myosin, causing contraction.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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