* Red blood cells (erythrocytes) are responsible for carrying oxygen throughout the body. During their development, they eject their nucleus and other organelles to make room for more hemoglobin, the molecule that binds oxygen. This means they lack the full complement of DNA found in other cells.

* Other cells in the human body, like skin cells, muscle cells, and nerve cells, all contain a full set of genetic material (chromosomes) in their nucleus.

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