Analysis of pulmonary thromboembolism. (A) Representative lung histology images on staining with hematoxylin/eosin (H&E) and phosphotungstic acid–hematoxylin (PTAH). Arrows indicate occluded vessels. Quantification of the percentage of occluded vessels is reported in (B), and analysis of the mean diameter of occluded vessels is reported in (C). Data have been collected by examining 10 microscopic fields for each lung section, prepared from 5 different animals, and are presented as mean ± SEM. **P < .01.