Definition of "troponin" [troponin]

• A calcium-regulated protein in muscle tissue occurring in three subunits with tropomyosin. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The test that's used conventionally is called troponin, which is just a protein that measures whether there's been death of heart cell, muscle cell tissue."
• "In the runners, levels of an enzyme called troponin, which rises in response to a strained heart and reduced flow of blood, were highest immediately after the marathon."
• "It gave them echocardiograms and tested their blood for troponin, which is a protein found in cardiac muscle cells and is an indication of cardiovascular problems."