"You may be losing stem cells in the process or changing the characteristic that shows these cells where to home, " says Hal E.

FORBES: Cell makers

"The loop has no characteristic temperature, so there is probably some ongoing process in there - that is our interpretation, " Dr Sakano told the BBC News website.

BBC: Arches Cluster, Leicester

It also lowered the so-called good cholesterol, or high-density lipoprotein (HDL), and it did not enter the cell, a characteristic Medford wanted hisdrug to have, because some of the oxidation process takes place within cellular membranes.

FORBES: Inflamed Hearts