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the mouth is a part of the digestive system. cells in the digestive system are the most quick cells to be replaced. so taking a sample from it won't cause much problem, unlike you take it by cutting open your leg and taking a sample.

the lining of the cheek is the easiest to take rather than having to take it from somewhere else. and the cells in the mouth are alive, unlike skin cells that are dead.

conclusion : it is the safest, fastest way to get live animal cells

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