What is the definition of Membership Blood Cells?

Ah, membership blood cells - the unsung heroes of our circulatory system, each with their own quirky personality and story to tell. Picture this: A red blood cell, feeling a bit like a rebellious teenager, decides to join a study group on the importance of oxygen transport. They say, "Hey, we need more adrenaline in our blood to keep up with your epic runs!" Meanwhile, a platelet, the tiny, clotting superhero, might whisper, "Sorry, I'm not exactly a study group member. My job is to stop bleeding before I turn into a bloodthirsty vampire."

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Now, for an unsettling example sentence: "As the corpse's last blood cell tried to assert its membership, it suddenly realized that 'don't tell no one' was a catchy slogan and decided to infiltrate the local bar, promising 'I'll keep you all safe from your morbid secrets!'"