At α = 0.05, the frequency of the E321G MYH1 variant in reining horses was statistically significantly different ( P value = 6.5 × 10 −4 ) from the frequency in the control group, and the difference in variant frequency between controls and working cow ( P value = 5.0 × 10 −2 ) and halter ( P value = 6.0 × 10 −2 ) horses approached significance.
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Prevalence of the E321G MYH1 variant for immune-mediated myositis and nonexertional rhabdomyolysis in performance subgroups of American Quarter Horses.
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