Pulmonary microemboli lysis study. (A) Solid circles show residual labeled microemboli remaining in the lungs of wild-type mice at the indicated times (n = 6). Open squares show the residual radioactivity in the lungs of line no. 19 mice studied in parallel (n = 6). Mean ± 1 SD is shown. (B) Representative autoradiograph of whole lung at the 30-minute time point. The animal genotype and the outline of the lungs are indicated.