Which cells have DNA?

Almost all cells in a person's body contain DNA. DNA, or deoxyribonucleic acid, is the hereditary material that carries the instructions for building and maintaining an organism. It's found in the cell nucleus, but a small amount is also present in the mitochondria, which are responsible for energy production within the cell. While most cells contain the same DNA, there are exceptions. For example, red blood cells lose their nuclei during maturation, so they do not have any DNA. Additionally, research is revealing that brain cells may have DNA blueprints that differ significantly from other cells in the body.