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Suppose that in a group of eight people, A , B , C , D , E , F , G , H each going shopping with at least one of the gang. A with B , C with D and E , B with E , F with G and H , H and B , E and A...

A researcher notices that at the same location in two copies of supposedly identical DNA, one DNA molecule has an A base, whereas the other has a C base. This researcher has just identified a:

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