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Fig. 7. Polymerase chain reaction analysis of transgenic IR50 T0 Plants 13, 14, and 15 showing a 1.4-kilobase (marked with arrow) Xa-21-specific DNA fragment amplified by primers U1 and I1. M = molecular weight marker; Lanes 1, 2, and 3 represent nontransformed IR50, IRBB21, pC822, and transgenic IR50 Plants 13, 14, and 15, respectively.