Structurally the<unk>  <unk>  is similar to lectins (sugar-binding<unk> s), and has a fold similar to that seen in C-type lectins. However, unlike other C-type lectins (those that bind various carbohydrates in the presence of calcium),<unk>  does not bind either calcium or any of the other carbohydrates that this family recognize. Instead,<unk>  recognises heparan sulfate proteoglycans. Two crystallographic structures of<unk>  have been determined.
Major basic protein
Defensin
Macrophage-activating factor
Interleukin
Beta defensin
Immunophilins
Alpha defensin
Lymphokine