5C9H:
reference: Structural basis of template-boundary definition in Tetrahymena telomerase., Jansson LI, Akiyama BM, Ooms A, Lu C, Rubin SM, Stone MD, Nat Struct Mol Biol. 2015 Oct 5. doi: 10.1038/nsmb.3101. PMID: 26436828

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