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Apamin TFA (Apamine TFA) is a toxin found in bee venom. It is a potent blocker of small conductance Ca2+-activated K+ (SK, KCa2) channels that is more effective at SK2 than SK1 and SK3.

Apamin (Apamine) is an 18-amino acid peptide neurotoxin found in apitoxin (bee venom). It is a specifically selective blocker of Ca2+-activated K+ (SK) channels and exhibits anti-inflammatory and anti-fibrotic activity.