In IPF, a group of CD36 + CD97+ Fbs has been identified in the remodeled areas of IPF tissue but with low expression of αSMA and ECM, suggesting that these Fbs are quiescent and are non-ECM producers in pulmonary fibrosis (Heinzelmann et al., 2018). Here, ACTA1 is linked to idiopathic pulmonary fibrosis.