4RWB:
reference: High-resolution structures of a heterochiral coiled coil., Mortenson DE, Steinkruger JD, Kreitler DF, Perroni DV, Sorenson GP, Huang L, Mittal R, Yun HG, Travis BR, Mahanthappa MK, Forest KT, Gellman SH, Proc Natl Acad Sci U S A. 2015 Oct 27;112(43):13144-9. doi:, 10.1073/pnas.1507918112. Epub 2015 Oct 12. PMID: 26460035

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