DNM1L and rheumatoid arthritis: Such findings support the notion that up‐regulated mitochondrial fission is associated with the development of different types of diseases, including inflammatory diseases.4, 17, 25, 26, 27, 28, 29, 36, 37, 38, 39, 40 To the best of our knowledge, this was the first report on up‐regulated DNM1L expression in STs from patients with RA and the correlations suggest that DNM1L expression may be a new biomarker to evaluate the severity of RA.