Cultures of gal10-null yeast expressing either WT, p.K161N-hGALE, p.D175N-hGALE, or no hGALE were inoculated into 96-wellplates at a density of 5 × 105cells/ml in SGE-Ura medium with the indicated amount of galactose added at t = 0. Growth of each culture was monitored as described in Materials and Methods. Values represent means ± SD; n ≥ 6. Resulting growth profiles are demonstrated for all four strains cultured in the presence of medium containing (a) 0 %, (b) 0.002%, (c) 0.01 % and (d) 0.02 % galactose.