The refined 1.9 A crystal structure of human alpha-thrombin: Interaction with D-Phe- Pro-Arg Chloromethylketone and significance of the tyr-pro-pro-trp insertion segment - Bode, W; Mayr, I; Baumann, U; Huber, R; Stone, S R; Hofsteenge, J (EMBO J, 1989)