Fibroblast activation w/ inflammatory arthritis studied by PET to detect fibroblast activation protein (FAP), but decreases after TNF or 17A inhib. Fibroblasts switch from pathogenic (MMP3+/IL6+) to pro-resolving phenotype (CD200+DKK3+) https://t.co/K1xAMqPiuT https://t.co/07NNgW9Lpv