Weird Substances: Hagfish Slime
hackaday.com
hackaday.com
"Hagfish slime is made of two different kinds of protein. One is a type of mucin, which acts much like the mucus that the human body uses to drown bacteria and viral intruders in antibodies and enzymes.
The other protein is in the form of tiny threads that are 100 times thinner than human hairs. These strong and stretchy threads act a lot like spider silk.
....
At any given time, a hagfish has about 20,000 km of fibers inside its body, ready to go"