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Purpose: A novel family of directly-gated ATP-ion channels is emerging. Our goal is to clone, functionally express and characterise new members of this family (P2X purinergic receptors).Methods: Degenerate PCR and low-stringency screening of cDNA libraries was used to isolate new P2X cDNAs. Electrophysiological recordings were made in Xenopus oocytes or transiently transfected HEK293 cells. Tissue...