I can't remember if I saw it in a cartoon, a documentary, or both, but the notion is that the clients of cleaner fish wait in line to be cleaned. "Clients" means the fish (or other aquatic animals) ...
I am currently studying systemic repression of both arbuscular mycorrhizae and nitrogen fixing bacteria in legumes. I know of the AON pathway (which works through CLE and NARK). I also know of ...