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Detection of Fusarium oxysporum forma specialis lactucae race 1-specific DNA fragment in lettuce seeds using PCR assay. Lanes: M, HyperLadder 50 bp DNA ladder (Bioline), 1–4 F. oxysporum f. sp. lactucae race 1 isolates; 5–6 non-pathogenic F. oxysporum; 7 positive control (F. oxysporum f. sp. lactucae race 1 DNA); 8 negative control (water replaced genomic DNA as the template).
