Scientists use LAL produced from harvested horseshoe crab blood to test for endotoxins

So scientists use an extract called LAL produced from harvested horseshoe crab blood to test for endotoxins. They add LAL to

a medicine sample, and if gels form, bacterial endotoxins are present. Today, the LAL test is used so widely that millions of

people who've never seen a horseshoe crab have been protected by their blood. If you've ever had an injection, that probably

includes you.