You Throw Away Your DNA 2 Million Times A Second

School biology says your DNA is in every cell of your body. Count your cells one by one and that stops being true for most of them. Red blood cells make up the large majority of all the human cells in an adult, and before each one leaves your bone marrow it pushes its nucleus - its copy of your genome - out of itself. A scavenger cell eats what was thrown away.

Your bones do this more than two million times a second, every second of your life. A drop of your blood can still identify you, but only because of the rare white cells mixed in with the red ones: they kept their nucleus.

All of this is by count, not by weight. Red cells are tiny, so by mass most of you is still nucleated fat and muscle.

Sources, in the order the video uses them:
Red blood cells are about 84 % of the ~30 trillion human cells in a reference adult (an estimate, by count; by mass fat and muscle cells dominate) - Sender, Fuchs & Milo, PLoS Biology 2016: https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002533
The precursor cell splits into a future red cell and a separate package holding the condensed nucleus, which bone-marrow macrophages engulf; enucleated red cells in all mammals - Migliaccio, Haematologica 2010: https://pmc.ncbi.nlm.nih.gov/articles/PMC2995553/
The contracting ring that pinches the nucleus off (press release on Ji et al., Nat Cell Biol 2008 - background for the ring, not a number) - Whitehead Institute via ScienceDaily: https://www.sciencedaily.com/releases/2008/02/080210145839.htm
Red cell turnover about 2.1 x 10^11 per day, mean lifespan about 116 days - Sender & Milo, Nature Medicine 2021, read as full text from a mirror: https://gwern.net/doc/biology/2021-sender.pdf (publisher page: https://www.nature.com/articles/s41591-020-01182-9). Per second: our arithmetic, 2.1 x 10^11 / 86,400 = about 2.4 million.
The DNA in a blood sample comes from the white cells; red cells have no nucleus - Gong, Scientific American 2009: https://www.scientificamerican.com/article/donor-blood-transfustion/
How rare the white cells are: 4,500-11,000 per microlitre against 3.8-5.7 million red cells, so roughly 1 in 345 to 1 in 1,270 (our arithmetic from reference ranges; they vary by person) - MedlinePlus: https://medlineplus.gov/ency/article/003643.htm and https://medlineplus.gov/ency/article/003644.htm
Why the video says "no nucleus" and never "no DNA at all": mature red cells can carry long DNA fragments (abstract read, not the full paper) - Liang et al., Advanced Science 2023: https://pmc.ncbi.nlm.nih.gov/articles/PMC9982546/