RGS2 and pulmonary fibrosis: Scoring the bleomycin-induced histological fibrosis by the Ashcroft method confirmed that pulmonary fibrosis was significantly increased in RGS2−/− mice as compared with RGS2+/+ mice (4.80 ± 0.15 vs. 3.53 ± 0.14, n = 5, p < 0.01) (Fig. 5e).