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

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

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

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.

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

Cytokines that interfere with viral replication and activate immune cells.

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

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

Site of T cell maturation and differentiation.

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

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.

Protect the body against both infectious disease and foreign invaders.

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

Release histamine and other chemicals during inflammatory and allergic reactions.

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

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

Phagocytose pathogens and release enzymes and antimicrobial proteins to kill them.