This web server performs a decomposition of a protein sequence into evolutionarily-related domains, based on the analysis of coevolutionary couplings between pairs of amino acid positions in a multiple sequence alignment. A detailed description of the algorithm is provided in: Granata D, Ponzoni L, Micheletti C, Carnevale V, "Patterns of coevolving amino acids unveil structural and dynamical domains", PNAS, 2017.