microoxen
n.— «The researchers attached a cargo of polystyrene beads to the backs of green algae cells and used light to guide them up and down the chambers.…The team have coined the term “microoxen” for the load-bearing microbes.» —“Cells made to haul tiny cargoes” BBC News (U.K.) Aug. 16, 2005. (source: Double-Tongued Dictionary)