How can llamas help defeat biological weapons?

Made you look, didn't I? This headline is lifted wholesale from HowStuffWork's article of the same name. It was so intriguing, I just had to post it.

Favorite quote:

...llamas are our friends. They're soft, good-natured and amusing to view...

and the meat of the article:

Llamas ... produce an antibody that is incredibly sturdy. It has no light protein chains, only heavy ones, making it not only hardy but also simple, with a tiny binding site.... Scientists can create these single-domain antibodies (sdAbs) quickly.... Because the binding site is so small, they're far easier and less expensive to engineer than other kinds of antibodies.... Using these tough, simple antibodies, scientists could develop a library of sensors to detect every bio-weapon imaginable -- and then very quickly develop antibodies that bind to new threats as they come up.

Isn't that fascinating? You should read the whole article. It's neat.