CEBPB and pulmonary fibrosis: Recent studies have shown that C/EBPβ deficiency results in a complete lack of segregated nucleus-containing atypical monocytes (Ly6C−F4/80−Mac1+Ceacam1+Msr1+) derived from Ly6C−FcεRI+ granulocyte/macrophage progenitors, preventing the development of bleomycin-induced lung fibrosis [190].