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  Indian J Med Microbiol
 

Figure 1: The number of revertant colonies of four strains of Salmonella typhimurium tested with or without the added S9 activation system: (a) TA97, (b) TA98, (c) TA100, and (d) TA102. ☆: More than twice the number of spontaneously revertant colonies compared to the number of mutated colonies in the control group

Figure 1: The number of revertant colonies of four strains of <i>Salmonella</i> typhimurium tested with or without the added S9 activation system: (a) TA97, (b) TA98, (c) TA100, and (d) TA102. ☆: More than twice the number of spontaneously revertant colonies compared to the number of mutated colonies in the control group