![](http://www.alamy.com/thumbs/6/EB985DEF-37FC-4D20-8371-A63C5FD45120/2JKWMRC.jpg)
Contracted myofibril, made up of myofilaments and proteins, allowing muscle contraction.
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Photo credit: © JACOPIN / BSIP / Alamy / Afripics
License: Royalty Free
Model Released: No
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