What is the definition of Precipitation Blood Cells?

Oh, let's talk about precipitation blood cells - the literal downpour of confusion in our bloodstream! These aren't your everyday raindrops, though. Precipitation blood cells are like a cosmic joke on our circulatory system - they're tiny, wet, and sent to cleanse the system of all sorts of 'dirty' things, including, well, the microscopic villains that try to hijack our bloodstream.

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And here's a particularly unsettling example sentence using this jargon: "As the heavy precipitation blood cells rained down on the bloodstream, they inadvertently started a cosmic joke that would make even the universe chuckle."