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The "ear" was grown on the mouses back because it's a good idea to have a "spare" human ear. The ear is very difficult to repair and is often damaged in car accidents, fights, fires, and also a disease called microtia; meaning "little ear" which can result in a slightly smaller ear or almost no ear. Also because it is mostly made of cartilage, which is hard to work with and the ear has a complicated shape that is highly visable.

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15y ago

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