Transgenic

Genetically modified mammals, or transgenics, are mammals that have been genetically engineered. They are an important category of genetically modified organisms.

In Deus Ex and Deus Ex: Invisible War
In both Deus Ex and Deus Ex: Invisible War,  transgenic creatures are created by VersaLife under the Genetically Modified Organism Project, which breeds creatures such as greasels and karkians. Both organisms appear to be recombinant creations. A third major project, grays, are supposedly cloned from DNA recovered from Roswell -- though they are also suggested to be engineered monkeys (such as ruck) that spit toxic substance and have no hair. After the Collapse, some of the creatures have escaped from VersaLife labs and roam free.