lymphokine: a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages)
cytokine: any of various protein molecules secreted by cells of the immune system that serve to regulate the immune system
hemlock: large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous