IL12B and neoplasm: We further quantified IL-12p70 protein levels in the ipsilateral (tumor-implanted) hemispheres in Il12b+/+ and Il12b−/− mice (Figure S1G) and found that IL-12 was expressed at low levels by both genotypes (Il-12b+/+ 1.2 ± 0.34 fg and Il-12b−/− 0.8 ± 0.03 fg, mean ± SEM (standard error of the mean)), indicating that CT-2A tumor growth did not increase in rIL-12 expression in the ipsilateral compared with the contralateral hemisphere.