blood from a young mouse--or even just a factor known as GDF11 from young mouse blood--can rejuvenate the muscles and brains of older mice. The findings have led to a clinical trial in which Alzheimer's patients are receiving plasma from young donors.
engineered E. coli that harbors two additional nucleotides--X and Y--in addition to the normal G, T, C, and A that make up the standard building blocks of DNA. Such synthetic bacteria can't reproduce outside the laboratory, but they may be used to create designer proteins with "unnatural" amino acids.
Old NID
151698
