Vellozo AF, Véron AS, Baa-Puyoulet P, Huerta-Cepas J, Cottret L, Febvay G, Calevro F, Rahbé Y, Douglas AE, Gabaldón T, Sagot MF, Charles H, Colella S. (2011) CycADS: an annotation database system to ease the development and update of BioCyc databases. Database 2011:bar008.