TWF1 and pulmonary fibrosis: Since bleomycin-induced mouse lung fibrosis is characterized by acute lung injury and inflammation in the early phase (day 0–10) followed predominantly by lung fibrosis (day >14), we started intraperitoneal tamoxifen or corn oil (vehicle control for tamoxifen) treatment on day 5 post-bleomycin administration so that a complete knockout of α6 in lung fibroblasts would be expected to occur at ∼14 days after lung injury; this minimizes potential effects of α6 deletion on the early phases of lung injury and inflammation.