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Lots of children have three parents.  A boy’s mother and father might divorce, and one remarries.  A girl might be raised by a single mother, a cousin, and an aunt.  But everybody, without exception, has two biological parents. For the moment, at least.

The United Kingdom is on the verge of permitting scientists to move forward with a procedure to create a human child from the DNA of three adults.  The United States may not be far behind.  Mothers everywhere should be deeply concerned.

The procedure, called mitochondrial replacement (MR), would combine genetic material from the eggs of two different women to create a newly-constructed egg, which would then be fertilized by sperm – creating, for the first time in human history, a child with three biological parents.

According to researchers, this would be done for therapeutic purposes to help women with certain mitochondrial defects avoid passing on those defects, which can cause damage to the heart, liver, brain, and kidneys, among other parts of the body.  Damaged DNA of the mother-to-be would be replaced by the healthy DNA...