5KXF:
reference: Crystal Structure of the SPOC Domain of the Arabidopsis Flowering Regulator FPA., Zhang Y, Rataj K, Simpson GG, Tong L, PLoS One. 2016 Aug 11;11(8):e0160694. doi: 10.1371/journal.pone.0160694., eCollection 2016. PMID: 27513867

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