Anatomy : What does an I band, with an A band in the middle, followed by another I band make up?

The light bands are called I bands and the dark bands are called A bands. In the middle of the I bands there is a line called the Z line (or disc). In the middle of the A bands (or dark bands) there is a light zone called the H zone. In the middle of the H zone there is another line, the M line.

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