The blue color of this crab's blood comes from the copper in the blood. In humans, the iron atoms in the blood give it a dark red color.
But it's not the color that fascinates scientists.
This crab's blood contains a special chemical that traps bacteria by clotting.
This blood can detect the presence of bacteria even when there are very few of them. This frozen part is used to make a bacterial test kit.
For species from America, this test kit is named Limulus Amebocyte Lysate (LAL), while the species from Asia was named Tachypleus Amebocyte Lysate (TAL).
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