News Genetics Crosses make lab mice even more useful New strains of lab animals bred to better pinpoint the genetic roots of disease By Tina Hesman Saey February 17, 2012 at 6:54 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print Scientists have built a better mouse. But rest easy — these mice don’t require improved traps. Mice bred for the Collaborative Cross project contain about 90 percent of the genetic diversity found in all laboratory mice.