TIMP1 and systemic sclerosis: qPCR analysis demonstrated that, compared with that in BLM‐SSc WT mice, the expression of fibrosis‐related genes (α‐SMA, Postn, Col1A1, Col1A3, Fn1, Timp1, Vimentin, and connective tissue growth factor, Ctgf) were downregulated in BLM‐SSc KO mice.