What is the definition of Frankfurt Blood Cells?

Frankfurt blood cells? Now, that's a fancy term for the unsung heroes of our circulatory system. Imagine them as the city's secret spies, but instead of stealing secrets or pulling off daring heists, they're just quietly shuffling through your veins, keeping you alive and breathing. They're the unsung, unsuspecting, yet absolutely vital blood cells that make sure your heart doesn't get too lonely in the big city of life.

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Here's a bit unsettling, shall we? "Frankfurt blood cells whispered their grim secrets to the city's mayor at 3 AM, just to remind him not to spill his coffee on the ancient frescoes."