| 2N1Q: reference: RNA structure. Structure of the HIV-1 RNA packaging signal., Keane SC, Heng X, Lu K, Kharytonchyk S, Ramakrishnan V, Carter G, Barton S, Hosic A, Florwick A, Santos J, Bolden NC, McCowin S, Case DA, Johnson BA, Salemi M, Telesnitsky A, Summers MF, Science. 2015 May 22;348(6237):917-21. doi: 10.1126/science.aaa9266. PMID: 25999508 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).