While it has been shown that proteins, specifically those containing reduced thiol groups, can be damaged by TeO32− , its direct effect on highly resistant bacteria is unclear. With the majority of known impacts of tellurite on cells being negative , except for the select few species that can anaerobically respire on TeO32− , we expected there would be reduced growth and, therefore, decreased protein in its presence. Indeed, strains E1, E4(1), RB3, and RB 16-17 showed a drop in protein production as expected (57.8%, 21.3%, 66.1%, and 41.5%, respectively) (Figure 1B). However, KR99 and E5 had an increase in protein levels (66.6% and 21.2%, respectively) (Figure 1A).