T-cell    a type of white blood cell that plays a central role in the body's immune defense system

telomerase    an enzyme found in cancer cells

thalassemia    an inherited blood disease in which the hemoglobin is abnormal

thoracic    related to the thorax, or chest area

toxicity    potentially poisonous effect of a drug or other substance

transcription    phase of cell reproduction during which genetic codes are copied

transport    process by which molecules pass through membrane tissue