3KYL:
reference: Structural basis for telomerase catalytic subunit TERT binding to RNA template and telomeric DNA., Mitchell M, Gillis A, Futahashi M, Fujiwara H, Skordalakes E, Nat Struct Mol Biol. 2010 Apr;17(4):513-8. Epub 2010 Mar 28. PMID: 20357774

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