Charybdotoxin
Charybdotoxin ( CTX ) is a 37 amino acid neurotoxin from the venom of the scorpion "Leiurus quinquestriatus hebraeus" ( "deathstalker" ) that blocks calcium-activated potassium channels . 
<triplet> Charybdotoxin <subj> neurotoxin <obj> instance of <subj> scorpion <obj> found in taxon