Decrease in viability of JMML cells supplemented with ribozyme Rzd. JMML cells were kept in liquid culture only (none), with only liposomes (DOTAP), or with liposomes containing the ribozymes Rzd or Rzdm. After 72 hours of incubation, the cells were harvested and their viability was assessed with flow cytometry after staining with propidium iodide. Results are the mean + SEM based on triplicate measurements from 1 patient and are representative of the 2 other patients.