The transition of bovine trypsinogen to a trypsin-like state upon strong ligand binding. The refined crystal structures of the bovine trypsinogen-pancreatic trypsin inhibitor complex and of its ternary complex with Ileu-Val at 1.9 Ã… resolution - Bode, W; Schwager, P; Huber, R (J Mol Biol, 1978)