6T3H:
reference: Inactivation of the dimeric RappLS20 anti-repressor of the conjugation operon is mediated by peptide-induced tetramerization., Crespo I, Bernardo N, Miguel-Arribas A, Singh PK, Luque-Ortega JR, Alfonso C, Malfois M, Meijer WJJ, Boer DR, Nucleic Acids Res. 2020 Jul 13. pii: 5870671. doi: 10.1093/nar/gkaa540. PMID: 32658272

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