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This results in what is called "mosaicism," where genetically different cells occur within one individual.

“Somatic mosaicism is likely playing a role” in these conditions, D’Gama says.

This mix of cell lines is called mosaicism.

A first pregnancy is questioned when test results indicate abnormal chromosomes — mosaicism — in the unborn child.

But out of eight embryos edited using CRISPR, Rebrikov’s team found evidence of mosaicism in only three of them at the blastocyst stage, when they are 5 days old and have about 250 cells.