Which molecules are involved in mediating local vasodilation and vasoconstriction at sites of injury? Prostaglandins IL-1 Complement H_2O_2 Lysozymes Which of the following cells are directly involved in seeking out and destroying cancerous cells without the aid of the entire immune system? N_k cells CTL T_1H T_2H Plasma Cell Which of the following cells are directly involved in stimulating the above mentioned cells? N_k cells CTL T_1H T_2H Plasma Cell Which of the following cells are directly involved in seeking out and destroying infective cells with the aid of the entire immune system? N_k cells CTL T_1H T_2H Plasma Cell