| 1YQQ: reference: Escherichia coli purine nucleoside phosphorylase II, the product of the xapA gene., Dandanell G, Szczepanowski RH, Kierdaszuk B, Shugar D, Bochtler M, J Mol Biol 2005 Apr 22;348(1):113-25. PMID: 15808857 |
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