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Mild acid hydrolysis of phosphomannan secreted by the yeast hansenula holstii (NRRL Y- 2448) produces two phosphomannyl fragments which differ strikingly in their potency as inhibitors of pinocytosis of human beta-glucuronidase by human fibroblasts. The larger molecular weight polyphosphomonoester fragment is 100,000-fold more potent an inhibitor of enzyme(More)
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