Autoradiograph of a DNA gel blot of XhoI-genomic digests of A. brassicicola wild-type Ab7 and aso1 mutants (aso1-2a, aso1-6a, aso1-10a, and aso1-11a) and the ectopic transformant Aso1-7E probed with the Aso1 gene fragment labeled with an ECL direct nucleic acid labeling and detection system (Amersham Biosciences, Piscataway, NJ).