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Consists of proteins that enhance the abilities of antibodies and phagocytic cells to clear pathogens.

Cytokines that interfere with viral replication and activate immune cells.

Produce antibodies to neutralize antigens and remember pathogens for faster response upon re-exposure.

Help control the immune response by maintaining tolerance to self-antigens and preventing autoimmune disease.

Ingest and digest pathogens and dead or damaged cells through phagocytosis.

Site of T cell maturation and differentiation.

Proteins secreted by immune cells that act as chemical messengers to guide the immune response.

Assist other cells in the immune response by secreting cytokines and providing additional activation signals.

Protect the body against both infectious disease and foreign invaders.

Filters blood, recycles old red blood cells, and helps mount an immune response to blood-borne pathogens.

Specialized lymphoid nodules in the small intestine that detect antigens and generate immune cells.

Carry out a variety of immune responses, including killing infected cells and activating other immune cells.

Destroy compromised host cells, such as tumor cells or virus-infected cells.

Capture antigens and present them to T cells, acting as messengers between the innate and the adaptive immune systems.

Bind to specific antigens, tagging them for attack by other elements of the immune system.

Display peptide fragments for recognition by T cells, enabling the immune system to detect infected cells.

Kill virus-infected cells and tumor cells by inducing apoptosis.

Facilitates the movement of immune cells and aids in the removal of foreign materials and waste from the body.

Release histamine and other chemicals during inflammatory and allergic reactions.