For those interested in organisms without a nucleus they're called prokaryotes [1], and apparently red blood cells don't have nuclei either. [1] https://en.m.

For those interested in organisms without a nucleus they're called prokaryotes [1], and apparently red blood cells don't have nuclei either. [1] https://en.m.wikipedia.org/wiki/Prokaryote https://en.m.wikipedia.org/wiki/Prokaryote