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We evaluated 173 patients in the Clinical Investigation of Duchenne Dystrophy study to determine if patients from the same kindred were more alike clinically than patients within the study population as a whole. A high intrafamilial correlation was noted for age-adjusted muscle strength scores. While noninherited factors could, in part, explain the results, it seems likely that genetic heterogeneity may contribute to the observed similarity within Duchenne dystrophy kindreds.
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Hyser et al. (1987) studied this question.
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