Kringles are aptly named for the Danish pastry that these pretzel-like structures resemble – three large loops stabilised by three disulfide bonds. Kringle domains are approximately 90 amino acids in length and are believed to play a role in med...

Kunitz domains contain approximately 60 residues with six specifically spaced cysteines arranged in three disulfide bonds with little secondary structure. They are specific inhibitors of trypsin-like proteinases with a highly conserved structure b...