Keywords: Nude mice.jpg Two grey nude mouse Nude mice because of a genetic defect have no thymus They cannot make certain cells essential for various immune responses This characteristic makes them extremely helpful to scientists working in Immunology Research Topics/Categories Animals Type Color Photo Source National Cancer Institute Linda Bartlett Photographer 1970 1980 Reuse Restrictions None - This image is in the public domain and can be freely reused Please credit the source and/or author listed above Linda Bartlett Photographer PD-USGov-HHS-NIH Media from National Cancer Institute Visuals Online Images uploaded by Fæ Animal testing Human hands holding mammals |