Convergent evolution of complex structures for ant–bacterial defensive symbiosis in fungus-farming ants - Li, Hongjie; Sosa-Calvo, Jeffrey; Horn, Heidi A.; Pupo, Mônica Tallarico; Clardy, Jon; Rabeling, Christian; Schultz, Ted R.; Currie, Cameron R. (Proceedings of the National Academy of Sciences, 2018)