The purpose of the project is to obtain homogeneous, reliable, documented and traceable annotations for Arabidopsis nuclear genes and gene products, and to enter them into an added-value database. The GeneFarm database contains gene entries and family entries. The family entries contain the description of the families including common features shared by all of the homologous genes (signature, biochemical function, keywords, paper review, etc.). The gene entries contain the complete annotation of the genes including data specific to each gene. This information is organized into different sections: target plant and genomic sequence, gene name and synonym(s), references to all cognate transcripts, intron–exon structure(s), deduced protein(s), regulatory motifs in promoters, biochemical function, protein localization, motifs and domains, secondary structure, post-translational maturation sites, biological function(s), mutant phenotype(s), expression condition(s), cross-references with other databases and bibliographic references. Each gene entry is linked to its corresponding family entry.