2MHF:
reference: Solution structure of the cyclic-nucleotide binding homology domain of a KCNH channel., Li Q, Ng HQ, Yoon HS, Kang C, J Struct Biol. 2014 Mar 14. pii: S1047-8477(14)00061-6. doi:, 10.1016/j.jsb.2014.03.008. PMID: 24632450

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