Cover: Micrographs showing distribution of Monastral blue-labeled, leaky blood vessels in rat tracheal mucosa after substance P. Tissue stained by esterase histochemistry to demonstrate regions of lymphoid tissue (brown). (Left panel ) Pathogen-free rat: Monastral blue labeling of normal postcapillary venules (arrows). Absence of brown-stained regions is consistent with absence of lymphoid tissue. (Right panel ) M. pulmonis-infected rat at 4 wk: Monastral blue labeling of numerous, tortuous angiogenic blood vessels (arrows) that are smaller than most normal postcapillary venules. Brown staining shows abundant mucosal lymphoid tissue. Bar = 75 µm. For further information, see the article by Dahlqvist and colleagues 237.
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