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IC50 values for the inhibition of cell proliferation by bestatin and actinonin. K562 cells (shaded) and U937 cells (open) were grown in presence of various concentrations of bestatin or actinonin and were counted on the 3rd, 4th and 5th days. IC50p values were determined from a plot of inhibition of cell proliferation against inhibitor concentration. Results are averages of two independent experiments and standard errors are indicated.
