6D2C:
reference: Structural and functional characterization of PL28 family ulvan lyase NLR48 from Nonlabens ulvanivorans., Ulaganathan T, Banin E, Helbert W, Cygler M, J Biol Chem. 2018 Jul 20;293(29):11564-11573. doi: 10.1074/jbc.RA118.003659. Epub, 2018 Jun 6. PMID: 29875159

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