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• humoral immune response


  antibodies, produced by B cells help neutralize or eliminate toxins and pathogens in the blood and lymph
• cell-mediated immune response


  specialized T cells destroy infected host cells
• t helper cells 


  activates both the humoral and cell- mediated immune responses
• antigen-presenting cell


  Antigen-presenting cells have class I and II MHC molecules on their surfaces, presenteren antigen
• Cytotoxic T Cells


  A Response to Infected Host Cells