The answer is proteins
It turns out that your brain's neurons are busier with DNA than you would think. Up to 40% of your neurons have DNA that has been deleted or duplicated. This indicates that the genomes within your neurons have been cut, edited, or cloned during the course of your life. This has occurred in somewhat diverse ways from neuron to neuron. This amounts to hundreds of alterations throughout your neural landscape, hardly the definitive fulfilment of order that scientists had previously anticipated. Today, scientists at the Salk Institute and elsewhere compare human brain genetics to a mosaic, a patchwork of disparate pieces that join together to form an unified work of art. McConnell, Mike
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