Helokinestatin-7 peptides from the venoms of Heloderma lizards

► The paper describes two novel peptides, helokinestatin-7S and helokinestatin-7H. ► Helokinestatin-7S is from the venom of the Gila Monster (Heloderma suspectum). ► Helokinestatin-7H is from the venom of the Mexican beaded lizard (Heloderma horridum). ► Helokinestatin-7 peptides had different effects on rat tail artery smooth muscle.