1B1E:
reference: Refined crystal structures of native human angiogenin and two active site variants: implications for the unique functional properties of an enzyme involved in neovascularisation during tumour growth., Leonidas DD, Shapiro R, Allen SC, Subbarao GV, Veluraja K, Acharya KR, J Mol Biol 1999 Jan 22;285(3):1209-33. PMID: 9918722

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