Transgenic mice
Transgenic organisms are organisms that contain a gene or genes which has been isolated from another organism and transferred into it.
Model organisms are used in labs to help scientists understand biological processes; model organisms, which are non-human species, are generally well understood and have their genomes sequenced. One such model organism, which is a vertabrate, like humans, is the mouse; The mouse genome is 95% similar to the human genome, which makes it an ideal species to study human disease.