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These mice exhibited severe myotonia, muscle weakness, impaired mobility, respiratory defects, and a marked reduction in lifespan.

Myotonic goats, a common domestic goat in the U.S., have a genetic condition called myotonia congenital that causes their muscles to stiffen when they’re frightened.

Examples include uses of the drug mexiletine to treat the rare muscle disease non-dystrophic myotonia, and experimental treatments for the Ebola virus.

He had been labeled with a number of interesting diagnoses, such as chorea, epilepsy, myotonia, hysteria, and neurasthenia.