From: Computational survey of peptides derived from disulphide-bonded protein loops that may serve as mediators of protein-protein interactions
Protein family
Disulphide-bonded
loop count
Somatotropin
91
Prolactin
50
Polygalacturonase/Endopolygalacturonase
Guanylate cyclase activator/Guanylin
13
Urotensin
12
Disintegrin
8
Calcitonin
6
Other
57
Total
287