inding Database is an open, web-accessible database of measured binding affinities, focusing on the interactions of proteins considered to be drug-targets with small, drug-like molecules. BindingDB contains over 640,000 binding data, for over 5,700 protein targets and 284,000 small molecules. BindingDB also includes a small collection of host-guest binding data of interest to chemists studying supramolecular systems. Learn more about the freely accessible database at www.bindingdb.org.