IFNs inhibit gpK8.1 and PF-8 expression. BCBL-1 cells stimulated with 30 nM TPA (A and C) or 0.3 mM n-butyric acid (n-BA) (B and D) in the presence or absence of IFN-α, IFN-β, or IFN-γ were examined for gpK8.1 (A and B) or PF-8 (C and D) expression. Symbols: ○, unstimulated cells; ●, stimulated cells; □, plus 20 ng of IFN-α per ml; ▵, plus 20 ng of IFN-β per ml; ■, plus 20 ng of IFN-γ per ml. Data represents the mean and standard error of the mean of at least three separate experiments.