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The 493-nucleotide BCL-2 5¡ä UTR was PCR-amplified from human genomic DNA
(Promega) using Pfu DNA polymerase. The UTR is present in two exons, 207 nucleotides in exon 1 and 286 nucleotides in exon 2, separated by an alternatively spliced intervening intron of 221 nucleotides.