IA9 TFA (human TREM-2 182-190 TFA) is a potent, CNS-penetrant TREM-2 inhibitor. IA9 TFA can diminish the release of proinflammatory cytokines and suppress joint inflammation and damage in a Collagen -induced arthritis (CIA) mouse model. IA9 TFA can be used for neuroinflammation PET imaging. IA9 TFA can be used for Rheumatoid arthritis (RA) and neuroinflammation research[1][2].