Alien blood saves human lives

It's blue, found on Earth, and it's a medical miracle

By Smartasaurus· 1 min read Wild

your life was saved by a creature with baby-blue blood

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The short version

It's blue, found on Earth, and it's a medical miracle
Pharmaceutical companies harvest this blue blood to test drugs and vaccines for contamination.
Despite their name, horseshoe crabs aren't crabs at all.

Human blood is red because of iron, but horseshoe crab blood is baby blue because it is built on copper. This ancient liquid is more than just a weird color; it is one of the most valuable substances in medicine.

Instead of white blood cells, these crabs use specialized cells called amebocytes. When these cells encounter even a trace of bacteria, they instantly turn into a thick gel. This 'clot' traps the invaders before they can infect the crab.

Pharmaceutical companies harvest this blue blood to test drugs and vaccines for contamination. If you have ever had an injection, your life was likely protected by a horseshoe crab. If the medicine touches a tiny drop of the crab's blood and it clots, the batch is discarded.

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