[troh-puh-nin, trop-uh-]

1965–70; tropo(myosin) (see tropo-, myosin) + -n- (of uncertain origin) + -in2 Unabridged

troponin I

[troh-puh-nin ahy, trop-uh-]
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. 2014.
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
troponin   (trō'pə-nĭn, trŏp'ə-)  Pronunciation Key 
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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Example sentences
His levels of a heart protein, troponin, were sky-high.
The tests measure two forms of cardiac troponin, a protein that is released into the bloodstream by dying heart cells.
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