Three possible results expected by competitive PCR with primers P28SL and P58SL. The results of gel electrophoresis of PCR products amplified from genomic DNA extracted from mouse organs are shown. The fragment of 517 bp corresponds to the internal control. The fragment of 329 bp corresponds to amplified F. solani DNA. Lane 1, inconclusive PCR result; lanes 2, 3, 4, 5, and 6, PCR-negative results; lanes 7, 8, and 9, PCR-positive results; lane T−, negative control.