6C08:
reference: Crystal structure of arginine-bound lysosomal transporter SLC38A9 in the cytosol-open state., Lei HT, Ma J, Sanchez Martinez S, Gonen T, Nat Struct Mol Biol. 2018 Jun;25(6):522-527. doi: 10.1038/s41594-018-0072-2. Epub, 2018 Jun 5. PMID: 29872228

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