1BOL:
reference: The crystal structure of ribonuclease Rh from Rhizopus niveus at 2.0 A resolution., Kurihara H, Nonaka T, Mitsui Y, Ohgi K, Irie M, Nakamura KT, J Mol Biol 1996 Jan 19;255(2):310-20. PMID: 8551522

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