CASZ1b regulates endogenous gene transcription. (A) Quantitative PCR was used to assess relative levels of TH, NGFR, and trkA mRNA 24 h after transfection of 293T cells with either WT CASZ1b, ZF4m, Δ31-185, ΔNLS1, or ΔC728 plasmids. (B) Quantitative RT-PCR was used to assess relative levels of TH and NGFR mRNA 24 h after transfection of 293T cells with WT CASZ1b or with ΔPTS2, ΔPRO, or ΔATP. Results are the means ± SDs of three independent experiments (*, P < 0.05).