We labeled RA FLSs with Vimentin (a fibroblast marker) and Cadherin‐11 (CDH11) (a functional indicator reflecting the invasive and proliferative characteristics of RA FLSs), and found that the relative fluorescence intensity of CDH11 in RA FLSs was highest at an inoculation density of 2 × 106 cells/mL. The gene discussed is VIM; the disease is rheumatoid arthritis.