Why is easy bruising so common in older adults? Most bruises form when small blood vessels (capillaries) near the skin's surface are broken by the impact of a blow or injury â often on the arms or legs. When this happens, blood leaks out of the vessels and initially appears as a black-and-blue mark. Eventually your body reabsorbs the blood, and the mark disappears.
HeLa cell. HeLa cell, a cancerous cell belonging to a strain continuously cultured since its isolation in 1951 from a patient suffering from cervical carcinoma. The designation HeLa is derived from the name of the patient, Henrietta Lacks.
HLA Matching. Human Leukocyte Antigens (HLA) is a type of protein that is found on the outer surfaces of cells. HLA protein is made up of six antigens, molecules that stimulate an immune response and help your body identify which cells belong to your body and which do not.t is the responsibility of a transplant center to find a stem cell donor for a patient, and not the individual. A doctor may perform a preliminary search for a donor without obliging the patient to necessarily undergo a stem cell transplant.