
Sample query to determine suitable libraries for a laboratory research project on differential gene expression between adult and fetal retina. (A) The query: “retina” results in a list of the 22 libraries associated with the term retina in the Anatomical System ontology. (B) Further refining the query to: “retina & adult” results in a list of the seven libraries associated with the terms retina in the Anatomical System ontology and also with the term adult in the Developmental Stage ontology. (C) A list of the three libraries that represent fetal retina can be obtained using the query “retina & fetus”.











