5.4.99.12 - 682845, 704385 5.4.99.12 isolation of virtually homogeneous tRNA pseudouridine synthase I from strains of Escherichia coli transformed with plasmid in which the production of tRNA pseudouridine synthase I is amplified 20fold 648849 5.4.99.12 wild-type and mutant enzymes D60A, D60S, D60E, D60N, and D60K 702197