RCN3 and pulmonary fibrosis: The Rcn3 expression in alveolar epithelium is markedly enhanced in bleomycin-induced pulmonary fibrosis, while selective deletion of Rcn3 in type II alveolar epithelial cells (AECIIs) exacerbated bleomycin-induced lung fibrosis, suggesting a protective role of Rcn3 in lung fibrosis [12].