Agarose gel visualization of Cunir3-4 PCR products. Lanes: 1 and 15, DNA size standards (Promega); 2, P. aureofaciens; 3, A. xylosoxidans; 4, A. faecalis 8750; 5, N. marina; 6, N. europaea; 7, N. eutropha; 8, N. briensis; 9, N. oceani; 10, NO3W; 11, URW; 12, C-113a; 13, C-45; 14, TA-921i-NH4. Arrows indicate the expected size of the Cunir3-4 product, 540 bp.