Correlation between the IC₅₀ and expression of ADF in T-cell leukemia cell lines. IC₅₀ (relative values v that of Jurkat) and expression of ADF (relative density of the bands v that of Jurkat) were plotted. r = .891, P < .01 (Pearson's correlation coefficient analysis). Also significant by Spearman's correlation coefficient analysis (P < .01).