 The predominant agents are those of the three-finger toxin family, including aminergic toxins, which act on muscarinic and adrenergic receptors, and fasciculins, which are anticholinesterase inhibitors that cause muscle fasciculation.Another prominent component are a group of proteins known as dendrotoxins; although structurally homologous to kunitz-type protease inhibitors, they block voltage-dependent potassium channels stimulating the release of acetylcholine and causing an excitatory effect.Another kunitz-type protein present is calcicludine, which blocks high-voltage-activated calcium channels.