MERRF syndrome

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MERRF syndrome (or myoclonic epilepsy with ragged red fibers) is a mitochondrial disease. It is extremely rare, and has varying degrees of expressivity owing to heteroplasmy. MERRF syndrome affects different parts of the body, particularly the muscles and nervous system.

Excerpt from the Wikipedia article “MERRF syndrome”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Modified_Gomori_trichrome_stain_showing_several_ragged_red_fibers_.jpg: Abu-Amero KK, Al-Dhalaan H, Bohlega S, Hellani A, Taylor RW. derivative work: CopperKettle (talk), CC BY 2.0, via Wikimedia Commons.