What is "keyhole limpet hemocyanin"

alt. (context biology English) A carrier for making antigens. Because of its large size and distant relation to humans and many test animals, KLH causes a large antigenic response. When paired with a hapten, the hapten also becomes immunogenic. n. (context biology English) A carrier for making antigens. Because of its large size and distant relation to humans and many test animals, KLH causes a large antigenic response. When paired with a hapten, the hapten also becomes immunogenic.

Keyhole limpet hemocyanin (KLH) is a large, multisubunit, oxygen-carrying, metalloprotein that is found in the hemolymph of the giant keyhole limpet, Megathura crenulata, a species of keyhole limpet that lives off the coast of California, from Monterey Bay to Isla Asuncion off Baja California.