Figure 4: The percent number of viable human leukemia cells B-CLL cultured in presence of B. subtilis BR1-S or BR1-C coated with polylysinepolyethyleneimine modified with fullerenol bilayer after 2 or 24 hour culture. As a negative control, the B-CLL cells were cultured in the culture medium. The values are presented in form: mean ± SD.