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troponin

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troponin /tro·po·nin/ (tro´po-nin) a complex of muscle proteins which, when combined with Ca2+, influence tropomyosin to initiate contraction.
tro·po·nin (trp-nn, trp-)
n.
A calcium-regulated protein in muscle tissue occurring in three subunits with tropomyosin.
troponin
[trō′pənin]
Etymology: Gk, trepein, to turn
a protein in the striated cell ultrastructure that modulates the interaction between actin and myosin molecules. It is believed to be part of the calcium-binding complex of the thin myofilaments. See also tropomyosin.
troponin
a complex of muscle proteins which, when combined with Ca2+, influence tropomyosin to initiate contraction.


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