B lymphocytes | T lymphocytes |
Mature in bone marrow. | Mature in thymus. |
В-cells form humoral or antibody-mediated immune system (AMI). | T-cells form the cell-mediated immune system (CMI). |
They secrete antibodies. | They secrete Lymphokines. |
They form plasma cells and memory cells. | They form killer, helper and suppressor cells. |