2SFA:
reference: Purification, characterization, primary structure, crystallization and preliminary crystallographic study of a serine proteinase from Streptomyces fradiae ATCC 14544., Kitadokoro K, Tsuzuki H, Nakamura E, Sato T, Teraoka H, Eur J Biochem 1994 Feb 15;220(1):55-61. PMID: 8119298

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