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Agarose gel electrophoresis of PCR products generated by the reactions described in the text. The source of the samples is as follows: lanes a and l, negative controls; lanes b–f, CSFs of five individuals with recent-onset schizophrenia (b, A1; c, A2; d, A3; e, A4; f , A5); lane g, genomic human DNA; lanes h–k, CSFs from four unaffected control individuals; and lane m, 50-bp markers. The nucleotide sequences corresponding to the visualized bands from the CSFs are presented in Fig. 2.
