Objective To investigate the mechanism of lung injury caused by ricin aerosol.Methods The alveolar epithelial cells of female BALB / c mice were isolated by cardiac blood ejection through perfusion,in situ digestion with collagenase and trypsin and tissue block migration culture,then purified by curettage and differential adhesion,and determined for purity by histochemical staining of cell slide with anti-cytokeratin monoclonal antibodies.Afterwards,the cells were treated with ricin at various final concent...