Not All Cells in Your Body Are Genetically Yours

Every human body contains “microchimeric” cells, which are non-genetically own cells that cross the placenta during pregnancy and can persist for decades. First noted in the late 1800s, these cells were initially thought to be temporary until 1993 when Y-chromosome cells were found in women long after giving birth. They exhibit regenerative properties and challenge immunological assumptions by not triggering rejection. Higher concentrations of these cells are linked to autoimmune conditions like diabetes and lupus.

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