Running releases an enzyme that is associated with memory function in mice and humans.
April 2, 2001|
Natural pathogenic bacteria populations can harbour mutator alleles (with high mutation rates) that may offer a selection advantage. In the March 30 Science, Giraud et al. describe a model to investigate the role of mutator alleles in influencing adaptation to complex environments in vivo (Science 2001, 291:2606-2608). They examined the colonization of the mouse gut by Escherichia coli strains with a high mutation rate due to a defective MutS protein. By examining bacteria in fecal samples they