Fig. 3. The same lineage of SMB-PS and 22F-infected cells was determined by microsatellite analysis. PCR-microsatellite analysis using the indicated primers was performed on DNA from SMB-PS cells (PS), 22F-challenged SMB-PS cells, clone F4 [22F (F4)] and the VM(Sincs7) mouse (mouse), the 22F-infected donor. Size calibration in base pairs (bp) is shown to left and right.