Extensive research which followed the discovery of DNA, to know more about its structure, function and mechanisms, led us to believe that each cell of our body contains the same DNA molecule – which is exclusive for each person. Due to this understanding, the possibility of encountering any instance of intra-organismal genetic variation was a far cry from reality; however, discoveries of mosaicism and chimerism in the early 1950s have forced us to rethink our beliefs while catalyzing ground-breaking research in the fields of evolutionary and developmental embryology.
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