FREAD is a database search loop modelling algorithm. Its primary use is to fill in the gaps in incomplete 3D models of protein structures. The input is a 3D model of a protein structure as well as the location and amino acid sequence of the loop region to be modelled. For more information, please refer to the following paper: Yoonjoo Choi and Charlotte M. Deane (2009). FREAD Revisited: Accurate loop structure prediction using a database search algorithm. Proteins, 78(6):1431-1440.