D009210Level 5
Myofibrils
**Definition:** The long cylindrical contractile organelles of STRIATED MUSCLE cells composed of ACTIN FILAMENTS; MYOSIN filaments; and other proteins organized in arrays of repeating units called SARCOMERES .
**Tree numbers:** - A10.690.552.875 - A11.284.430.214.190.750.620 - A11.620.249.850 - A11.620.500.500
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