[arrosenberg]

Every cell in your body (excepting red blood cells) has a complete copy of your genome. What differs is which portions are activated.

[RaftPeople]

Except for in the brain (13% to 41% of neurons with variation, deletions, additions, etc., first discovered in 2001, study below from 2013 confirmed).

https://www.science.org/doi/10.1126/science.1243472