A cardiac-specific protein released when heart muscle cells are damaged, making it the gold standard test for diagnosing heart attacks. Elevated levels appear within 3-6 hours of cardiac injury.
From Greek 'tropos' (turn) + 'in' (protein suffix), named in 1965 for its role in muscle contraction regulation. The name reflects how this protein 'turns on' muscle contraction when calcium binds to it.
Troponin is so heart-specific that even tiny amounts in blood scream 'heart attack!' The test is incredibly sensitive - it can detect heart muscle damage equivalent to just 1 gram of heart tissue, about the size of a paper clip.
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