microchimerism

microchimerism
The presence of donor cells in a graft recipient, or of fetal cells remaining in maternal circulation, which can be detected by molecular methods but not by flow cytometry.

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mi·cro·chi·mer·ism (mi″kro-ki-mērґiz-əm) the presence in an individual of small numbers of cells or small amounts of DNA derived from another genetically distinct individual, as of donor cells in a graft recipient or of cells transferred between mother and fetus during pregnancy.

Medical dictionary. 2011.

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