This article explores the development of a novel biomedical research organism, and its potential to remake the species and spaces of translational medicine. The humanized mouse is a complex experimental object in which mice, rendered immunodeficient through genetic alteration, are engrafted with human stem cells in the hope of reconstituting a human immune system for biomedical research and drug testing. These chimeric organisms have yet to garner the same commentary from social scientists as other human–animal hybrid forms. Yet, they are (...) rapidly being positioned as central to translational medicine in immunological research and pharmaceutical development. This article explores the complex relations between species and spaces they seek to enact. Humanizing mice simultaneously moves these animal forms towards the intimate geographies of corporeal equivalence with humans and the expansive geographies of translational research. These multiple trajectories are achieved by the way humanized mice function as both uncertain ‘epistemic things’ and as expansive ‘collaborative things’, articulating mouse genetics with other research, notably stem cell science. In the context of post-genomics, their indeterminacy is critical to their collaborative value; their expansive potential follows as much from their biological openness as from specific expectations. Yet, these new research organisms have both accumulative and disruptive capacities, for there are patterns of interference between these trajectories, remaking boundaries between experimental practices and clinical contexts. (shrink)

In summary, the creation and maintenance of the Wistar Rats as standardized animals can be attributed to the breeding work of Helen Dean King, coupled with the management and husbandry methods of Milton Greenman and Louise Duhring, and with supporting documentation provided by Henry Donaldson. The widespread use of the Wistar Rats, however, is a function of the ingenuity of Milton Greenman who saw in them a way for a small institution to provide service to science. Greenman's rhetoric, as captured (...) in his Director's Reports, prepared annually from 1905 until his death in 1937, shows that he was unusually sensitive to his times and to the economics of science and of society. In the era when biology was being defined, he recognized in the rat the potential to be a living analog to the pure chemicals that legitimated experimental science. From management literature he extracted the ideals of uniformity of product, standards of quality, and efficiency of production, applying them to scientific practice to generate an animal model that thrives as standard equipment in laboratories throughout the world today.I will close with a quote from Frederick W. Taylor that is a cogent statement of the contribution to science and scientific progress made by standardized tools and their creators. Equating the surgeon and the workman, Taylor wrote: [He is given] the finest implements, each one of which has been the subject of special study and development ... [and] the very best knowledge of his predecessors; and, provided with standard implements and methods which represent the best knowledge of the world up to date, he is able to use his own originality and ingenuity to make real additions to the world's knowledge, instead of reinventing things which are old.Standardized tools, whether surgeons' implements or laboratory-bred rats, are one of the vehicles for carrying scientific knowledge forward from generation to generation. In this sense, Greenman's Wistar Rats have done their job, in his words, of “providing service to science.”. (shrink)