PCR amplification and probing of the strN (A) and strF (B) genes. (C) Southern analysis of strF. (A) Lanes: 1, 1-kb ladder; 2, ASSF13; 3, ASSF15; 4, ASSF22; 5, ASB27; 6, ASB33; 7, ASB37; 8, S. griseus; 9, negative control. (B) Lanes: 1, S. griseus; 2, ASSF13; 3, ASSF15; 4, ASB22; 5, ASB27; 6, ASB33; 7, ASB37; 8, 1-kb ladder. (C) Same as for panel B.