1JN9:
reference: Crystal packing of plant-type L-asparaginase from Escherichia coli., Michalska K, Borek D, Hernandez-Santoyo A, Jaskolski M, Acta Crystallogr D Biol Crystallogr. 2008 Mar;64(Pt 3):309-20. Epub 2008, Feb 20. PMID: 18323626

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