Whetzel PL, Brinkman RR, Causton HC, Fan L, Field D, Fostel J, Fragoso G, Gray T, Heiskanen M, Hernandez-Boussard T, Morrison N, Parkinson H, Rocca-Serra P, Sansone SA, Schober D, Smith B, Stevens R, Stoeckert CJ, Taylor C, White J, Wood A. Development of FuGO: an ontology for functional genomics investigations. OMICS. 2006; 10(2):199-204.