Horseshoe Crab Blood
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250 million years ago the horseshoe crabs looked exactly the same as they do today. The simplicity of the organism and the lack of predators pushed evolution to the side. The blood of a horseshoe crab allows pharmaceutical companies around the world check for potential bacterial contamination in their products. These crabs have been found to possess antibiotic qualities, virus fighting agents, and cancer preventatives.
Limulus Amebocyte Lysate is what the blood is called when derived. The blood of the crabs is actually bright blue to the eye [source].
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