🤪 Fun & Weirdpublished 2w ago
Horseshoe crab blood is bright blue and saves human lives
Horseshoe crabs have bright blue blood because it uses copper-based hemocyanin rather than iron-rich hemoglobin to transport oxygen. Even weirder, their blood contains specialized immune cells called amebocytes that coagulate instantly around dangerous bacterial endotoxins. Biomedical companies harvest this blue blood to test vaccines, IV drips, and medical implants for contamination, ensuring that life-saving medications injected into humans are safe.
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