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Mammalian sensory neurons express a voltage-gated sodium channel named SNS. Here we report the identification of an SNS transcript (SNS-A) that contains an exact repeat of exons 12, 13 and 14 encoding a partial repeat of domain II. Because the exons 12-14 are present in single copies in genomic DNA, the SNS-A transcript must arise by trans-splicing. Nerve growth factor, which regulates pain thresholds,...