Further analysis of the expression level of the myofibroblast marker FN1 in fibroblasts revealed that the proportion of myofibroblasts was higher in HLF than in NLF (95.34% vs. 60%) (Supplementary Figure 1A), which revealed that the proportion of myofibroblasts increased during the progression of LF fibrosis. This evidence concerns the gene FN1 and Lassa fever.