This work is a joint project between EnsemblGenomes at the European Bioinformatics Institute and the group of Doreen Ware at the Cold Spring Harbor Laboratory, who have developed the Gramene database, a resource for plant comparative genomics based on Ensembl technology. A common set of databases are available through EnsemblGenomes and Gramene, and the two groups are collaborating on the integration of content, quality control and the development of new features.