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Muscle structure seen at the EM level

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Description
a) A model of the sarcomere.

b) An electron micrograph showing the same features.

c) A schematic drawing of cross sections of a sarcomere in the various regions shown in (a) and (b). Thick filaments are indicated by heavy brown dots, thin filaments by small purple dots.

d) A higher magnification within an A band showing cross-bridges between actin and myosin filaments.
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