ACROSS
4. a functional unit of muscle contraction
6. thick band
8. a filamentous protein running along actin
9. light band
10. myosin nonoverlapped with actin
DOWN
1. a regulatory protein with three subunits
2. a monomeric unit of the thick filament
3. unmasks the myosin binding site on actin
5. a thick filament
7. a thin filament
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