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2. Microchimerism

If a person's genetics contain a small number of cells from another individual, this is microchimerism. These cells are genetically distinct from the cells of the host. Fetomaternal microchimerism is the most common form in humans. A fetus’ cells travel through the placenta and into the mother. The pregnant mother then absorbs them. These cells can survive in the mother’s body for several decades. Microchimerism can also occur during gestation of twins in the womb. The twins may share cells with each other or their mother.

microorganisms chimerism PeopleImages / Getty Images

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