| 1 | In these cases, a blood test may show an increase in the lymphocyte count. | |
| 2 | Thus, lymphoid organs have populations of both B and T lymphocytes. | |
| 3 | Antigen processing by macrophages precedes recognition of an antigen by lymphocytes. | |
| 4 | They interfere with the work of normal lymphocytes, which weakens the patient's immune response. | |
| 5 | White blood cells called T-lymphocytes hunt down germs and other foreign tissue. |