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We report two brothers with the Angelman syndrome. With the exception of the reports by Kuroki et al, all previously reported cases were sporadic. Overall sex ratio is M1:F1. Genetic heterogeneity may be present. Further data are required to determine emperic recurrence risks after a first occurrence in a family. A few cases may be due to autosomal or X‐linked recessive inheritance. No chromosome abnormality has been found to date.
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Pashayan et al. (1982) studied this question.
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