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Direct sequencing results of LKB 1 gene PCR products in sporadic PJS patients. Arrows, mutation sites. (A) and (B). Only 1 (c.G>T) polymorphic site was observed in intron between exon 1 and exon 2 in 2 sporadic PJS patients. No mutation was detected in any exons of LKB1 gene in the 5 sporadic PJS patients.
