The refined 1.9 A crystal structure of human cx-thrombin: interaction with D-Phe-Pro- Arg chloromethyl ketone and significance of the Tyr-Pro-Pro-Trp insertion segment - Bode, W; Mayr, I; Baumann, V; Huber, R; Stone, S R; Hofsteenge, J (EMBO J, 1989)