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a small rodent, various species of which are used in laboratory experiments.
1. a small loose body.
2. a computer pointing device.
joint mouse a movable fragment of synovial membrane, cartilage, or other body within a joint; usually associated with degenerative osteoarthritis and osteochondritis dissecans.
knockout mouse a mouse that has had a specific gene artificially deleted from its genome.
nude mouse a mouse homozygous for the nu gene; these mice are hairless, lack a thymus, and thus lack T lymphocytes.
peritoneal mouse a free body in the peritoneal cavity, probably a small detached mass or omentum, sometimes visible radiographically.
a hairless mutant mouse with thymic hypoplasia, lacking T cells.
inbred strain of laboratory mouse which is hairless and has no thymic tissue. Because it has no source of T lymphocytes, it suffers from a defect in cell-mediated immunity and is highly susceptible to infections. This trait is utilized for immunological studies. Called also athymic mouse.