3WOA:
reference: Co-translational folding of alpha-helical proteins: structural studies of intermediate-length variants of the lambda repressor., Hanazono Y, Takeda K, Miki K, FEBS Open Bio. 2018 Jun 27;8(8):1312-1321. doi: 10.1002/2211-5463.12480., eCollection 2018 Aug. PMID: 30087834

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