What is the definition of Permissions Blood Cells?

Permissions blood cells: These are like the superpowered secret agents of your bloodstream, but instead of superhero capes and cape-waving, they're tiny, red-packed warriors with the mission to keep you alive. They have permissions - that's right, they get to say 'yes' or 'no' to every medical procedure you're about to undergo. It's like they're the ultimate gatekeepers of your life, but with a much more complicated backstory involving red blood cell clotting, white blood cell vigilance, and possibly a few too many times they've been mistaken for cancerous cells.

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Edgy example sentence: "After my dentist decided to give me a root canal, 'permissions blood cells' rolled in like a bad pun: 'Can I have my teeth removed to free up space for your new superpowered heart?'"