Fig. 2. Butyric acid sensitizes HeLa and BHK cells to Shiga toxin. HeLa (A) and BHK (B) control cells were grown with tetracycline for 48 hours and with or without 2 mM butyric acid (ba) for the last 24 hours. The cells were then incubated with increasing concentrations of Shiga toxin for 2 hours and the protein synthesis measured. The error bars represent deviations between duplicates.