Reshared post from +Pieter Greyling

"…Accepted dogma holds that—although every cell in the body contains its own DNA—the genetic instructions in each cell nucleus are identical. But new research has now proved this assumption wrong. There are actually several sources of spontaneous mutation in somatic (nonsex) cells, resulting in every individual containing a multitude of genomes—a situation researchers term somatic mosaicism. “The idea is something that 10 years ago would have been science fiction,” says biochemist James Eberwine of the University of Pennsylvania. “We were taught that every cell has the same DNA, but that's not true.” There are reasons to think somatic mosaicism may be particularly important in the brain, not least because neural genes are very active…"

Scientists Surprised to Find No Two Neurons Are Genetically Alike
The genetic makeup of any given brain cell differs from all others. That realization may provide clues to a range of psychiatric diseases

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