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β-Galactosidase activities of strains T1, T1-E, and K. lactis CBS2359. Cultivations were done as described in Materials and Methods with either 2% lactose (solid bars) or 2% glucose (hollow bars). Cell extracts were prepared from growing cells (OD600, 0.5 to 2.5). Error bars (for T1 and T1-E) represent standard deviations of results from three (lactose) or four (glucose) independent cultivations. β-Galactosidase activity was not detected in the supernatants from any of the cultivations.
