Mouse fetuses help mother’s hearts

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Cardiomyocytes damaged by a heart attack.

As it turns out, nature has its own method for transplanting stem cells. When a pregnant mouse has a heart attack, her fetus goes to work to help repair the damage! The experiment mated female lab mice with males who had the genes to produce green fluorescent protein (GFP). Around half the embryos produced also had the ability to produce the protein. This way, scientists could track fetal cells separately from maternal cells. Then heart attacks were induced in the pregnant mice…

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