Antimutagenic activity of the enzyme preparation Binase has been studi
ed in a set of bacterial test systems. It was shown that at concentrat
ions of 0.2, 2, and 20 mu g/ml the preparation did not significantly i
nfluence the spontaneous mutation level in the Ames test. Binase demon
strated no antimutagenic properties under simultaneous incubation with
the mutagen. An antimutagenic effect was found after preincubation of
bacterial cells with the Binase preparation.