Although fibroblasts expressing αSMA were observed in large scars after myocardial infarction (63, 64), the absence of αSMA in interstitial fibrosis was found in some cases of pulmonary fibrosis (65, 66) but also in heart muscle (67), which might explain the rather low level of αSMA in some donors. The gene discussed is ACTA1; the disease is myocardial infarction.