4MIW:
reference: High-resolution structure of the N-terminal endonuclease domain of the lassa virus L polymerase in complex with magnesium ions., Wallat GD, Huang Q, Wang W, Dong H, Ly H, Liang Y, Dong C, PLoS One. 2014 Feb 7;9(2):e87577. doi: 10.1371/journal.pone.0087577. eCollection , 2014. PMID: 24516554

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