The amounts of IL-23p19, IL-12Rβ1, IL-23R, IL-27, and IL-27R (WSX-1) mRNAs in the spinal cord and cerebrum were quantified by real-time RT-PCR. Samples were obtained from WKAH rats 7 months after HTLV-1 infection (black columns) and from age-matched uninfected controls (white columns). In each group, at least three rats were used. Results of experiments done in triplicate were evaluated as relative expression levels to the GAPDH gene. Data from experiments done independently three times are represented as the fold increase (mean ± SD values) to the data without infection (white columns). *P < 0.05.