Horses with IMM experience rapid, widespread atrophy of the gluteal and expaxial muscles.

Mutation Behind Immune-Mediated Myositis in Horses Identified

A somewhat mysterious, sometimes fatal muscle-related disease in Quarter Horses is getting a little clearer. Researchers recently determined that immune-mediated myositis (IMM) is due to a genetic mutation encoding a protein that’s expressed in adult equine muscle.

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