Polymorphism associated with Hbr-containing loci. (a) Agarose gel of the PCR products visualized with ethidium bromide. (b) Autoradiograph of PCR products probed with Hbr-hm1. (c) Autoradiograph of PCR products probed with the flanking genomic sequence of the corresponding Hbr element. M, 100-bp DNA ladder; 1, GH94-1062; 2, Zea parviglumis; 3, Zea mexicana; 4, Zea huehuetenangensis; 5, Zea diploperennis; 6, Zea luxurians; lanes 7–14 are the following maize inbred lines: 7, B73; 8, B79; 9, A554; 10, AC88; 11, 1022; 12, 4722; 13, W23; 14, C13. Cropping of photographs did not remove any visible bands.