Becirovic, E., M. Biel, V. Hammelmann, F. Hofmann, and U. B. Kaupp. “Cyclic Nucleotide-Regulated Channels (version 2019.4) in the IUPHAR/BPS Guide to Pharmacology Database”. IUPHAR/BPS Guide to Pharmacology CITE, Vol. 2019, no. 4, Sept. 2019, doi:10.2218/gtopdb/F71/2019.4.