ACTA2 and idiopathic pulmonary fibrosis: Previous research has recognized Pdgfra, Acta2, and Col1a1 as markers for pulmonary myofibroblasts (Kheirollahi et al., 2019; Peyser et al., 2019; Liu et al., 2021) Periostin (Postn) has been observed to be significantly upregulated in the IPF model (Nance et al., 2014).