CD274 and vascular disorder: Thus, the objective of this study was to determine whether the expression of B7-H1 on ERCs can be upregulated by the stimulation of IFN-γ and to determine the role of ERC-expressing B7-H1 in preventing transplant vasculopathy in aorta allografts by using neutralizing anti-B7-H1 monoclonal antibody (mAb).