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The cell-suspension was transferred onto a minimum medium prepared by adding 5 μg/dl kanamycin, 10 mg/dl L-leucine, 10 mg/dl L-leucine, 10 mg/dl L-arginine, 100 mg/dl D, L-m-fluorophenylalanine and 2 g/dl agar to a basal minimum medium of pH 7.2 containing 0.6 g/dl KH2PO4, 1.4 g/dl K2HPO4, 0.2 g/dl (NH4)2SO4, 0.1 g/dl sodium citrate, 0.02 g/dl MgSO4.7H2O, and 0.5 g/dl glucose. After 3 days cultivation at 37° C., two colonies appeared on the agar-medium.

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