| Thin Filaments |
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| • | actin
filaments in the sarcomere are of fixed length |
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| • | actin
filaments are cross-linked by -actinin at Z-line |
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| • | both ends of
actin filaments are capped |
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| • | barbed
ends are embedded at the Z-line |
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| • | tropomyosin
and troponins bind along each filament |
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