The present invention provides a method of quickly and accurately detecting and/or assaying an antigen using fluorescence correlation spectroscopy (FCS), which involves a fluorescence-labeled antibody fragment and a non-fluorescence-labeled intact antibody that form a complex with the antigen. There...http://www.google.co.uk/patents/US7476545?utm_source=gb-gplus-sharePatent US7476545 - Method of quickly detecting and/or assaying antigen by fluorescence correlation spectrometry
