🩸 WHY IS O NEGATIVE BLOOD SO PRECIOUS? 🩸 Let’s talk about blood types—and why O negative donors are kind of a big deal. Red blood cells aren’t just smooth little discs—they’re like tiny red spiky balls. Those spikes? They’re called antigens, and they’re like ID tags on the surface of your cells. 🧬 The three main ones we care about in blood typing are: — A antigen — B antigen — D antigen (also known as Rh factor) Your immune system is very picky. If it sees an antigen it doesn’t recognize, it