What is the definition of Selective Blood Cells?

Selective blood cells are like the superheroes of your bloodstream - they choose their battles! They're the only ones who get to decide who gets the spotlight on your blood, and sometimes that spotlight is a bit too spotty. Picture this: "When my immune system decided to play 'Who's the Baddest Neighbor?' and tagged me for being the most contagious flu virus, I was left with a selectable blood cell crisis."