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4-Nitrophenyl alpha-D-Galactopyranoside CAS7493-95-0A chromogenic substrate yielding a soluble chromophor for the colorimetric assay of alpha-D-galactosidase upon cleavage. Employed in the detection of hydrolases in tissues and membranes
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p-Nitrophenyl-β-D-Galactopyranoside CAS3150-24-1Determination of β-galactosidase substrate.