This Web site from the journal Nature offers a one-stop online resource for information on the mouse genome -- "the experimental key to the human genome." Visitors have free access to all content from the journal's special mouse genome issue. Web features include an interactive timeline detailing the history of the mouse in genetics, related news articles and commentary, Web links, and more. Scientific papers and letters to Nature are also available for those who would like to delve into the subject at depth. Additionally, the site provides a selection of classic research papers free to registered users until March 5, 2003.