6D9I:
reference: Crystal structure of duck egg lysozyme isoform II (DEL-II)., Langley DB, Christ D, BMC Struct Biol. 2018 Aug 22;18(1):10. doi: 10.1186/s12900-018-0090-7. PMID: 30134879

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).