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1. |
Which one of the following statements is correct about T-lymphocytes in mammals? |
A. | These are produced in thyroid. |
B. | There are three main types - cytotoxic T-cells, helper T-cells and suppressor T-cells. |
C. | These are originated in lymphoid tissues. |
D. | They scavenge damaged cells and cellular debris. |
Answer» D. They scavenge damaged cells and cellular debris. | |