Back in the 1950s in a weird, vampiric experiment, scientists first showed that connecting the circulatory systems of old and young mice seems to rejuvenate the more elderly animals. A handful of labs have recently been racing to find factors in young blood that may explain this effect. Now, a Harvard University group that claims to have found one such antiaging protein has published a study countering critics who dismissed the work on the molecule as flawed.
Ref: Circulating Growth Differentiation Factor 11/8 Levels Decline with Age. Circulation Research (21 October 2015) | DOI: 10.1161/CIRCRESAHA.115.307521