Fluorophore-assisted carbohydrate electrophoresis (FACE�) is a technique that has been successfully used to determine the structure of N-linked oligosaccharides (1 ,2 ). The method was originally introduced by Peter Jackson (3 ) to separate both mono- and oligosaccharides, and several reviews have appeared since then on this subject (4 –7 ). The techniques used here are relatively simple and can be carried out in most biochemical laboratories.