(a) Anti-IL-12 antibodies increase TNFα release from UVB-irradiated adult keratinocytes. Adult keratinocytes were irradiated with 30 mJ per cm2 of UVB, 5 J per cm2 of UVA, or sham irradiated, and then given media without (minus symbols) or with (plus symbols) 10 µg anti-IL-12 antibody per ml followed by 24 h of incubation at 37°C. Displayed are TNFα concentrations in the conditioned media. (b) Anti-IL-12 antibodies increase TNFα release from UVB-irradiated fibroblasts. Fibroblasts were irradiated with 30 mJ per cm2 of UVB, or sham irradiated, and then given media without (minus symbols) or with (plus symbols) 10 ng IL-1α per ml, 10 µg anti-IL-12 antibody per ml followed by 24 h of incubation at 37°C. Displayed are TNFα concentrations in the conditioned media.