Sheep lung diagram and pictures. (A) The blue line represents the path of the bronchoscope to deliver the adult stem cells or saline. The red circumferences show the areas where the lung tissues were sampled. Lung congestion and edema are visually apparent as a consequence of endotoxin infusion. Pictures of the left lung of a sheep before (B) and one hour after the end of the infusion of endotoxin (C).