Figure 6 :(A) In rat blood samples incubated with or without additives, there was an increase in plasma K+ after 4 h. There was no difference between untreated controls after 4 h and samples treated with either acetone extract of Cleistanthus collinus (n = 4, P = 0.625, with WSR test for both doses of C. collinus) or Ouabain (n = 4, P = 1 with WSR test). (B) In human blood, while ouabain caused a significant elevation of blood K+ after 4 h (n = 6, P = 0.031 with WSR test), there was no change in samples incubated with C. collinus extract (n = 6, P = 0.25 with WSR test).