One of the mysteries of the English language finally explained.
Originally: a protein found in muscle-plasma, believed to be the soluble precursor of myosin (now historical). Later (more fully "myogen A", "myogen B", "myogen I", "myogen II", etc.): any of a group of soluble proteins obtained by extraction of muscle with cold water, most of which have been identified as glycolytic enzymes.
Late 19th century; earliest use found in Journal of the Chemical Society. From myo- + -gen, after German Myogen, shortened from Myosinogen.
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