Cardiac mRNA levels of fibronectin, a marker of myocardial fibrosis, were massively increased in 0 ppm H2S treated animals (p<0.01), while no increase was detected in animals of both H2S treated groups (10 ppm H2S p<0.05; 100 ppm H2S p<0.01) (Figure 3C). Here, FN1 is linked to Myocardial fibrosis.