Following the complete genome sequencing of different plant species such as Arabidopsis (Arabidopsis thaliana), rice (Oryza sativa), and Physcomitrella (Physcomitrella patens), as well as advances toward deciphering entire proteomes, the need for a reliable way to identify protein-protein interactions is becoming a major task for the future. Bimolecular fluorescent complementation (BiFC) is a n...