4RL3:
reference: A class III chitinase without disulfide bonds from the fern, Pteris ryukyuensis: crystal structure and ligand-binding studies., Kitaoku Y, Umemoto N, Ohnuma T, Numata T, Taira T, Sakuda S, Fukamizo T, Planta. 2015 Oct;242(4):895-907. doi: 10.1007/s00425-015-2330-4. Epub 2015 May, 22. PMID: 25998529

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