2Z7F:
reference: Complex of human neutrophil elastase with 1/2SLPI., Koizumi M, Fujino A, Fukushima K, Kamimura T, Takimoto-Kamimura M, J Synchrotron Radiat. 2008 May;15(Pt 3):308-11. Epub 2008 Apr 18. PMID: 18421166

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