What is the definition of Producers Blood Cells?

Producers blood cells? Like, imagine your body as a giant blood bank, but instead of just producing red and white cells, it's also churning out 'producer blood cells' - a term that sounds more like something from a sci-fi movie than the medical field. These are actually precursors to all the blood cells, basically the body's little biological cell factory, setting the stage for your very own blood revolution.

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Now, here's an edgy example sentence: "The CEO of the blood industry decided to 'produce more producer blood cells' by implementing a new policy that required every employee to spend the weekend in a blood bank donation drive, or else they'd be stuck with 'inadequate precursor cells' for their future medical needs."