The regional Ki values in 9L tumors are calculated for different treatments and expressed as the percentage over that of control (% of control). The data represent mean ± SD. Refer to the results for Ki values. Potassium channel agonists and bradykinin were infused for 15 minutes with permeability determined at the 5 to 15-minute time interval, as described in the method. Bradykinin treatment served as the positive control. A, Treatments of KCO912 and MS in 9L/Wistar; C, Treatments of KCO912 and MS in 9L/Fischer; C, Treatments of KCO912 and glybenclamide in 9L/Wistar. BK, bradykinin; MS, minoxidil sulfate. The P values represent the comparisons to the control.