T-helper cell n.
immune system cells that produce lymphokines that regulate the activities of other immune system cells, such as T cells, B cells, and monocytes, that are necessary for the differentiating of B cells into antibody-producing cells, and that often decrease in concentration following HIV infection.
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
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