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Interesting PDB structure article at PDBe (页面存档备份,存于互联网档案馆)
Lee C, Bongcam-Rudloff E, Sollner C, Jahnen-Dechent W, Claesson-Welsh L. Type 3 cystatins; fetuins, kininogen and histidine-rich glycoprotein. Frontiers in Bioscience. January 2009, 14 (14): 2911–22. PMID 19273244. doi:10.2741/3422.