5H3U:
reference: Structural basis for specific recognition of pre-snRNA by Gemin5., Tang X, Bharath SR, Piao S, Tan VQ, Bowler MW, Song H, Cell Res. 2016 Dec;26(12):1353-1356. doi: 10.1038/cr.2016.133. Epub 2016 Nov 11. PMID: 27834343

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