Effects of skullcap extract (ethanol, hexane, chloroform, ethyl acetate, butanol, and water) on ex vivo splenocytes from ovalbumin (OVA)-sensitized BALB/c mice. (A) Interleukin (IL)-4 and (B) Interferon (IFN)-γ were quantified by enzyme-linked immunosorbent assay (ELISA) using splenocytes; (C) Cell viability and cytotoxicity were measured by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay; (D) Inhibition rate (%). Values are presented as mean ± standard deviation (SD) (n = 4 in each group). Data were analyzed by analysis of variance (ANOVA), followed by Duncan’s multiple-range test. Data are statistically different (p < 0.05) among those columns with different symbols. The order of value is termed as order of alphabet.