text: lymphocytes are produced in the bone marrow.\nthere are 3 different types:\n\nNatural Killer Cells (NK) They attack and lyse host cells(cells that are in your own body) that have either turn cancerous or are infected by a virus or bacteria.\n\nT cells are involved in nonspecific defense, humoral immunity and cellular immunity\n\nB-cells fuction as an antigen-presenting cell