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Two adult siblings with progressive pyramidal and extrapyramidal lesions, and generalized muscle atrophy had a profound deficiency of beta-galactosidase in all the cells and body fluids examined. Neuraminidase activity was normal in fibroblasts. The fused fibroblasts of infantile GMl-gangliosidosis and each of these adult patients had beta-galactosidase activity as expected for the average value in a mixture of equal numbers of parental cells. However, there was a remarkable increase in the activity of beta-galactosidase when the cells from each of these cases were fused with those from the beta-galactosidase-deficient adult with cherry-red spots, cerebellar ataxia, myoclonus and neuraminidase deficiency in fibroblasts. It was concluded that the two siblings represent a new genetic variant (adult type) of GMl-gangliosidosis.
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