Journal Article Research Support, Non-U.S. Gov't Allospecific T cell reactivity Antibodies Antibody-mediated rejection B7-H1 Antigen BTLA BTLA protein, human CD274 protein, human Co-inhibitors Cytomegalovirus HLA Antigens Interleukins Lung transplant MKM3CA6LT1 PD-1 Receptors, CXCR5 Receptors, Immunologic Solid organ transplantation T follicular helper cell T follicular regulatory cell T-cells de novo donor-specific HLA-antibodies interleukin-21