The sarcomers are made up fro two types of overlapping structures, thick myosin filaments lying parallel to an another, and thin filaments made up of F-actin and also arranged in parallel. The dark outer regions of the A band contain both thick and thin filaments, while in the control H zone there are only myosin filaments. The 2 lines correspond to sites where the thin filaments are anchored to a so called Z disc.

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