Immune checkpoint inhibitor PD-1 pathway is down-regulated in synovium at various stages of rheumatoid arthritis disease progression. by Yanxia Guo, Alice M Walsh, Mary Canavan, Mihir D Wechalekar, Suzanne Cole, Xuefeng Yin, Brittney Scott, Mathew Loza, Carl Orr, Trudy McGarry, Michele Bombardieri, Frances Humby, Susanna M Proudman, Costantino Pitzalis, Malcolm D Smith, Joshua R Friedman, Ian Anderson, Loui Madakamutil, Douglas J Veale, Ursula Fearon, Sunil Nagpal

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