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Sea anemone venom is rich in bioactive compounds, including peptides containing multiple disulfide bridges. In a transcriptomic study on Oulactis sp., we identified the putative 36-residue peptide, OspTx2b, which is an isoform of the KV channel blocker OspTx2a (Sunanda P et al. [2018] Identification, chemical synthesis, structure and function of a new KV1 channel blocking peptide from Oulactis sp...