Mouse News Letter (MNL) was a bulletin of mouse genetics information published from 1949 to 1998. In 1990 Mouse News Letter changed its name to Mouse Genome which merged with the journal Mammalian Genome in 1998. Mouse News Letter now exists as a company, Mouse News Letter Ltd, which promotes the science of Genetics and provides funds to enable younger scientists to attend Genetics Conferences. “To survey the history of the Mouse News Letter is to see the history of mouse genetics unfold.” So wrote Mary F Lyon in 1997.