Fig. 1

CircMAPK9 expression was increased in RA patients and RA-FLSs. A Schematic illustration exhibiting the circularization of MAPK9 exons 16 to 21 forming circMAPK9. B The expression of circMAPK9 was determined by qRT-PCR analysis in synovial tissues from RA patients (n = 22) and normal patients (n = 22). C The abundance of circMAPK9 in RA-FLSs and control H-FLSs was measured via qRT-PCR. D The expression of circMAPK9 and linear mRNA (MAPK9) was examined via qRT-PCR after RNase R treatment. *P < 0.05