Fig. 2. Polymorphic bands (within rectangle) amplified by primer pair GWM 111 from DNA of RWA-resistant sources PI 137739 (Dn1), PI 262660 (Dn2), PI 294994 (Dn5), PI 220127 (Dnx), and PI 243781 (Dn6), electrophoresed in a 2% agarose gel. The top band in each lane, corresponding to the characteristic fragment of CS, is associated with Dn1, Dn2, Dn5, Dnx, and Dn6 (as described in text); L = 100-bp DNA ladder.