High Quality Content by WIKIPEDIA articles! Function-spacer-lipid constructs (FSL constructs) are amphiphatic, water dispersible biosurface engineering constructs that can be used to engineer the surface of cells, viruses and organisms, or to modify solutions and non-biological surfaces with bioactives. FSL constructs spontaneously and stably incorporate into cell membranes. FSL constructs with all these afore mentioned features are also known as KODE™ constructs. The process of modifying surfaces with FSL constructs is known as "koding" and the resultant "koded" cells,viruses and liposomes are respectively known as kodecytes,kodevirions and kodesomes.