T cell, peripheral
A T cell that is found in the peripheral blood rather than in the lymphatic ‘system.
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- T cell
A type of white blood cell that is of key importance to the immune system and is at the core of adaptive immunity, the system that tailors the body’s immune response to specific pathogens. The T cells are like soldiers who search out and destroy the targeted invaders. Immature T cells (termed T-stem cells) migrate […]
- T (thymine)
In genetics, T stands for thymine, one member of the A-T (adenine-thymine) base pair in DNA. The other base pair in DNA is G-C (guanine-cytosine). Each base pair forms a “rung of the DNA ladder.” A DNA nucleotide is made of a molecule of sugar, a molecule of phosphoric acid, and a molecule called a […]
- Td immunization
Td is the vaccine given to children over six and adults as a booster for immunity to diphtheria and tetanus.
- Tear
A drop of the salty secretion of the lacrimal glands which serves to moisten the conjunctiva and cornea.
- Tear film
The liquid layer bathing the cornea and conjunctiva. It creates a perfectly smooth liquid outer layer that polishes the corneal surface, mechanically traps and flushes out foreign bodies and chemicals, contains bacteriostatic substances that inhibit the growth of microorganisms, and reduces the surface friction associated with eyelid blinking and eye movement.