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The effect of GAT1 expression on DAL80 expression in gln3Δ strains. β-Galactosidase production was supported by a pTSC572 transformant of strain TCY55 (gln3Δ GAL1,10-GAT1) or TCY64 (gln3Δ dal80 GAL1,10-GAT1) with proline or ammonium sulfate as the nitrogen source and 2% galactose plus the indicated concentration of glucose as the carbon source as per Fig. 3 and Materials and Methods.
