A) It is naturally fluorescent, allowing for easy detection of impurities.
B) It contains a specialized clotting agent that detects bacterial endotoxins.
C) Its high oxygen-carrying capacity makes it a universal blood donor.
D) It can survive extreme temperatures, making it stable for transport.
Explanation
Horseshoe crab blood contains Limulus amebocyte lysate (LAL), a substance that clots in the presence of even tiny amounts of bacterial endotoxins. This makes it invaluable for testing the sterility of injectable drugs, vaccines, and medical implants.
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