Within every muscle of every living species with a backbone, a protein called myosin tugs on a partner protein to generate a muscle contraction. This function, discovered in mammals a century ago, has been presumed by scientists to operate the same way among birds, reptiles, amphibians and fish.

Source: [Phys.org](https://phys.org/news/2026-07-hidden-muscle-machinery-reveals-gene.html)

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