Complement System:The complement system is a collection of proteins that work together as part of the immune response to help or 'complement' the ability of antibodies and phagocytic cells to clear pathogens and damaged cells from an organism.
Membrane Attack Complex (MAC): The membrane attack complex is the final step in the complement cascade, where the complement proteins assemble into a pore-forming structure that inserts into the target cell's membrane, causing it to rupture and the cell to lyse.
Antibody-Dependent Cell-Mediated Cytotoxicity (ADCC): ADCC is a mechanism of cell-mediated immune defense whereby an effector cell of the immune system actively lyses a target cell, whose membrane-surface antigens have been bound by specific antibodies.