In accordance with analysis of multiplexed immunofluorescence images, comparing cell type abundance in adult RA and JIA datasets revealed that capillary (FLI1+/SPARC+) and venous cells were more abundant in JIA synovial tissue in whichever direction label transfer was applied (FDR < 0.01; Fig. 7G, fig. This evidence concerns the gene FLI1 and juvenile idiopathic arthritis.