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Figure S1. The cellular targets of TNF in TNF-driven arthritis: radioresistant stromal cell targets are responsive to the pathogenic effects of TNF. Representative histology of ankle joint sections from BM-reconstituted mice. (A) Tnf^ΔARE/+ BM into a WT recipient. (B) Tnf^ΔARE/ΔARE TnfRI^−/− BM into a WT recipient. (C) Tnf^ΔARE/+ BM into a TnfRI^−/− recipient. Paraffin sections are stained with hematoxylin and eosin. Bars, 600 μm.