FIGURE 4: Conversion of GT to BmGT over time in yeast expressing GtmA. (A) BmGT is not detected in supernatants of yeast cells exposed to exogenous GT over 3 h exposure. (B) BmGT is readily detected in supernatants from yeast cells expressing gtmA. Increased levels of BmGT can be detected over a 3-hour time period and correlate with a diminution GT levels.