| 6MSM: reference: Molecular structure of the ATP-bound, phosphorylated human CFTR., Zhang Z, Liu F, Chen J, Proc Natl Acad Sci U S A. 2018 Nov 20. pii: 1815287115. doi:, 10.1073/pnas.1815287115. PMID: 30459277 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).