(A) Ramos cells were transfected with siRNA for the indicated BH3-only proteins followed by preparation of total cell lysates and determination of Bad, Bim, Bik, and Puma by immunoblot. All represents lysates from cells transfected with siRNA for Bad, Bim, Bik, and Puma. (B) Ramos cells were transfected with siRNA for control (circles, solid line), Bad (squares, long dashes), Bik (diamonds, short dashes), Bim (triangles, dotted line), Puma (inverted triangles, alternating long and short dashes), or All (open circles, solid line) followed by treatment with Bz-423. Cell viability (24 h) was determined by PI exclusion. ** = P < 0.001 for Control vs. All. In addition, P < 0.01 for Control vs. Bad at [Bz-423] ≥ 6 µM; P < 0.01 for Control vs. Bik at [Bz-423] ≥ 5 µM; P < 0.02 for Control vs. Bim at [Bz-423] ≥ 5 µM; P < 0.02 for Control vs. Puma at [Bz-423] ≥ 6 µM; P < 0.05 for All vs. Bad or Bik or Bim or Puma at all [Bz-423] ≥ 3 µM.