PACmn for improved optogenetic control of intracellular cAMP. - Yang, Shang; Constantin, Oana M.; Sachidanandan, Divya; Hofmann, Hannes; Kunz, Tobias C.; Kozjak-Pavlovic, Vera; Oertner, Thomas G.; Nagel, Georg; Kittel, Robert J.; Gee, Christine E.; Gao, Shiqiang (BMC Biology, 2021)