Immunity and Molecular Signals

Clonal selection and tolerance select for survival of lymphocytes that will protect the host from foreign antigens.

Cytokines and chemokines are both small proteins secreted by cells of the immune system.

Superantigens are a class of antigens that cause activation of T-cells and massive cytokine release.

The complement system helps antibodies and phagocytic cells clear pathogens from an organism.