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The double mutations in BcβGal and BbβGal caused the highest reduction in galactose affinity, while no satisfactory results were observed to KlβGal. Using computational tools, mutants that reduced galactose affinity without significantly affecting lactose binding were proposed. The mutations proposed can be used to reduce the negative feedback process, improving the catalytic characteristics of β-galactosidases and rendering them promising for industrial applications. © 2020 American Institute of Chemical Engineers.BACKGROUND Urine cytol