| T4 | Thyroxine, a thyroid hormone. (The number 4 is usually in subscript.) thyroid hormones are essential for the function of every cell in the body. They help regulate growth and the rate of chemical reactions (metabolism) in the body. (12 Dec 1998) |
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| t4 cell | T helper cells which are targets for HIV infection. (09 Oct 1997) |
| t4 helper lymphocyte | A specific type of lymphocyte, derived from the thymus gland, that plays an important role in cellular immunity. T4 lymphocytes (CD4 cells) are decreased (absolute counts less than 200) in patients with AIDS resulting in compromised immune function. (27 Sep 1997) |