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Two I bands on the sides (actin only) and an A band in the middle (myosin, partially overlapping with actin). This is a rather crude division of the sarcomere, mind you.
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∙ 11y ago
The three sections along the length of a sarcomere are the A band, the I band, and the H zone. The A band is the dark region in the center of the sarcomere that contains both thick and thin filaments, while the I band is the light region at the ends of the sarcomere that contains thin filaments only. The H zone is the region in the center of the sarcomere where only thick filaments are present.
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