Humoral and cellular immunityHumoral immunity1930s, Elvin Kabat, gamma-globulinThe active molecules in immunoglobulin fraction, antibodies, contained in body fluidCellular immunity1883, Elie Metchnikoff, observe phagocytes Cell-mediated immunity1950s, lymphocytes, the cell responsible for both cellular and humoral immunityAntigen Recognition by T Cells