Effect of specific NF-κB inhibition on cell survival. After 4 days in culture, the NF-κB inhibitor, wedelolactone (100 μM). strongly inhibited cell survival in the CD56⁺ cell K562 but had no significant effect on the CD56(-)MUTZ-2 acute myeloid leukemia cells (mean ; SEM, triplicates). One representative experiment of 3. Slides were viewed through a Leica HCX microscope (Leica, Wetzlar, Germany) with a PL Fluotar L lens at 40×/0.60 corr PH2. Images were acquired with a Leica DMIL camera (Leica) and Olympus DP-Soft version 5.0 (Olympus) and processed using Adobe Photoshop version 3.0 (Adobe Systems).