Microbiology + time travel (because I love time travel and it was the only way to get me excited about this story. Now... as someone who wants things to be as scientifically accurate as possible... it's... slightly tempting to see if I can figure out a way to have a semi-plausible explanation for cellular time travel but that's probably impossible sooo)
And how it works is that we have a CDK-1, took part in mitosis, thought it was the height of their fulfillment, the most self-actualizing thing they could ever do, and they were wholly and entirely satisfied.
Until, after mitosis, the daughter cell they ended up in had a DNA mutation, so time to destroy the cell!
And to the CDK-1 this is an ultimate betrayal of the DNA (cytoplasmic proteins more or less sort of 'worship' the idea of the DNA and its instructions for every possible scenario,…