Study explains effect of injecting young blood in old mice
Four years after discovering the "rejuvenating" effect of injecting young blood in ageing mice, California-based researchers have identified its mechanism. The team found that infusing young blood boosted levels of a gene-regulating enzyme Tet2 in the brain's hippocampus which deals with memory and learning. A reduction of Tet2 levels causes reduced birth of neurones, leading to cognitive decline.