1G2I:
reference: Crystal structure of an intracellular protease from Pyrococcus horikoshii at 2-A resolution., Du X, Choi IG, Kim R, Wang W, Jancarik J, Yokota H, Kim SH, Proc Natl Acad Sci U S A 2000 Dec 19;97(26):14079-84. PMID: 11114201

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