The term cytokine is derived from a combination of two Greek words - cyto meaning cell and kinos meaning movement. Cytokines are cell signalling molecules that aid cell to cell communication in immune responses and stimulate the movement of cells towards sites of inflammation, infection and trauma.
Organs that have been successfully transplanted include the heart, kidneys, liver, lungs, pancreas, intestine, and thymus. Some organs, like the brain, cannot be transplanted. Tissues include bones, tendons (both referred to as musculoskeletal grafts), corneae, skin, heart valves, nerves and veins.
Most often, organ donors are deceased, but some organs can be donated by living donors. Deceased organ donors can donate: kidneys (2), liver, lungs (2), heart, pancreas, and intestines. In 2014, hands and faces were added to the organ transplant list. Living organ donors can donate: one kidney, a lung, or a portion of the liver, pancreas, or intestine.