Aim To investigate the effect of non-T cell binding peptide( FNS007) on collagen type Ⅱ-induced arthritis( CIA) in mice and the possible mechanisms.Methods The CIA model was induced by intradermal injection of bovine C Ⅱ + Freunds adjuvant. At the clinical onset of CIA,mice were randomly divided into6 groups: blank control group( Control),model group,ORENCIA( abatacept) group,FNS007 low dose( 1. 2mg · kg~(-1)) group,FNS007 middle dose( 2. 4 mg ·kg~(-1)) group and FNS007 high dose( 4. 8 mg·kg~(-1))group. FNS...