GAPDH and cystic fibrosis: Interestingly, INRs tended to have higher IL-7Rα mRNA levels than CF patients and HIV-seronegative controls, although these difference were not statistically significant (INRs: 41.33±49.64 ng IL-7 Rα/10 ng GAPDH, CFs: 6±2.16 ng IL-7 Rα/10 ng GAPDH; p = .3 for INRs vs. CFs; p = .5 for INRs vs. HIV-seronegative subjects; p = .7 for CFs vs. HIV-seronegative subjects) (Figure 2C).