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Any of a group of peptide cofactors of enzymes for the lysosomal degradation of sphingolipids. They stimulate various enzymes, including glucosylceramidase, galactosylceramidase, cerebroside-sulfatase, alpha-galactosidase, beta-galactosidase, and sphingomyelin phosphodiesterase. [ISBN:0198506732]
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