are a type of white blood cell of which we study two main types:
, which develop in the thymus, form different lineages with specialised functions. These include cell-mediated immunity, recognising and killing other cells infected by microorganisms or transformed to malignancy; other T cells provide help to B cells to generate antibodies with improved recognition of antigens; T cells also provide essential restraint on immune responses to avoid tissue damage and aid in the repair of damaged tissues.
, which develop in the bone marrow, mediate humoral by secreting , and form memory B cells which can rapidly respond to new infections. Like T cells there are many subsets of B cells with specialised functions including regulatory functions that control the immune response.
Each type of lymphocyte interacts with other white blood cells to mount an immune response.