Researchers from Catholic University of Korea published data from a study that investigated the effect of miRNA-21a-5p on fibrosis development in systemic sclerosis (SSc). With the aim of assessing the pathological impact of miRNA-21a-5p on skin and lung fibrosis in vivo, a bleomycin-induced SSc murine model was developed, and the mice were hydrodynamically injected with plasmids containing pre-miRNA-21a-5p or anti-miRNA-21a-5p.