Wiktionary
gorgonin
n. (context protein English) A complex protein frequently containing appreciable quantities of iodine and bromine that makes up the horny skeleton of typical gorgonians.
Wikipedia
Gorgonin
Gorgonin is a complex protein that makes up the horny skeleton of the holaxonia suborder of gorgonians. It frequently contains appreciable quantities of bromine, iodine, and tyrosine.