The mitochondrion produce a substance called adenosine triphosphate. It is also known as ATP. It is believed to be our source of energy. ATP's main purpose is to transport chemical energy within cells for metabolism[2]. Metabolism is the sum of the physical and chemical changes that take place in living organisms.
Stem cell harvest. Stem cells used to be harvested from the bone marrow. That has now largely been abandoned in favour of harveting directly from the peripheral blood.
For example, blood stem cells can be found in the bone marrow and in the peripheral blood (circulating blood). A bone marrow transplant involves harvesting the stem cells from the bone marrow of a donor volunteer and after being prepared and grown, giving them to the patient.