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Protoxin II,CAS#:165168-50-3,Catalog Number: N1030-V,Sequence:YCQKWMWTCDSERKCCEGMVCRLWCKKKLW NaV channels and T-type Ca2+ channels, ProTx-II inhibits NaV channels1. ProTx-II could also modulate T-type Ca2+ channels at higher concentrations. Sources Protoxin-II is a neurotoxin that is derived from the venom of the Peruvian green velvet tarantula (Thrixopelma pruriens). Chemistry ProTx-II is a 30-amino acid peptide with a molecular weight of 3826.65 Da. The structure of ProTx