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Psalmotoxin 1,Catalog Number: O1120-V,Lyophilized,Purity95% ASIC1a channels, Psalmotoxin-1 inhibits cation currents mediated by acid-sensing ion channels (ASIC1a). Psalmotoxin (PcTx1) is a spider toxin from the venom of the Trinidad tarantula Psalmopoeus cambridgei. It selectively blocks Acid Sensing Ion Channel 1-a (ASIC1a), which is a proton-gated sodium channel. Sources Psalmotoxin is a toxin produced in the venom glands of the South American tarantula Psalmopoeus