<unk>  (ἀφαίρεσις (aphairesis, "a taking away")) is a medical technology in which the blood of a person is passed through an apparatus that separates out one particular constituent and returns the remainder to the circulation. It is thus an extracorporeal therapy. One of the uses of<unk>  is for collecting stem cells.
Apheresis
Photopheresis
Dialysis
Aquapheresis
Rheopheresis
Iridodialysis
Plasmapheresis
Hemoperfusion