When a pregnant woman suffers organ damage, the fetus will send stem cells to repair the damaged organ.

One such study involved mating normal female mice with males genetically engineered to produce a green-fluorescing protein in all their body cells. Half the resulting fetuses also produced this protein, which made it easy to discern any fetal tissue in the mother.

A team if scientists from the Mount Sinai School of Medicine in New York, led by Hina Chaudhry, inflicted a heart attack on the pregnant mice before killing them a fortnight later to observe the effect on their hearts.

Some fluorescent cells were found in the damaged heart tissue of the mothers, where repair was hastened by transformation into new heart cells, which included blood vessel cells and among others. The researchers observed that the fetus promotes its own survival by protecting the heart of its mother.

Previous research has also identified fetal stem cells in other damaged organs of pregnant women, including the liver, kidney, lung and even the brain. Fetuses also produce cells that are known to shield the mother from breast cancer.

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