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1. |
What is the normal count of Helper T-cells in human beings? |
A. | 1200/mm<sup>3</sup> |
B. | 800/mm<sup>3</sup> |
C. | 200/mm<sup>3</sup> |
D. | 2000/mm<sup>3</sup> |
Answer» B. 800/mm<sup>3</sup> | |