4YNW:
reference: Coordinated Ribosomal L4 Protein Assembly into the Pre-Ribosome Is Regulated by Its Eukaryote-Specific Extension., Stelter P, Huber FM, Kunze R, Flemming D, Hoelz A, Hurt E, Mol Cell. 2015 Apr 29. pii: S1097-2765(15)00220-8. doi:, 10.1016/j.molcel.2015.03.029. PMID: 25936803

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