3ELV:
reference: Crystal structure of the Pml1p subunit of the yeast precursor mRNA retention and splicing complex., Trowitzsch S, Weber G, Luhrmann R, Wahl MC, J Mol Biol. 2009 Jan 16;385(2):531-41. Epub 2008 Nov 7. PMID: 19010333

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