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What structure is composed of protein filaments and is located in the center of the thick filaments?

User Ege Ersoz
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Final answer:

The M line is the structure composed of protein filaments found in the center of the thick filaments.

Step-by-step explanation:

The structure composed of protein filaments and located in the center of the thick filaments is called the M line. The M line is a vertical line found in the middle of the H zone in a sarcomere, which is the basic unit of contraction in a muscle. It serves as an attachment site for accessory proteins that hold the thick filaments together.

User Chapay
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