mice

Sakaguchi then isolated mature T-cells from genetically identical mice and injected them into the mice without a thymus, and that appeared to protect them.

To study the effects of green tea on obesity, the research team fed mice a high-calorie diet for four weeks, with both fat and what they call a "cafeteria diet," which mimics the Western diet.

We walked through tree branches, tangled vines and sharp hanging stalactites, over roots as thick as a human leg, and carcasses of birds, mice and God knows what else in varying states of decay.

Other familiar model organisms include mice, fruit flies and baker's yeast.

Still others got it by eating infected wild birds, rats or mice, or from contact with dairy workers’ contaminated clothes or boots.