5WZY:
reference: Structural insights into the nucleotide base specificity of P2X receptors., Kasuya G, Fujiwara Y, Tsukamoto H, Morinaga S, Ryu S, Touhara K, Ishitani R, Furutani Y, Hattori M, Nureki O, Sci Rep. 2017 Mar 23;7:45208. doi: 10.1038/srep45208. PMID: 28332633

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