EFO
The Experimental Factor Ontology describing experimental variables
...All EFO development and source code has been moved to https://github.com/EBISPOT/efo ***
The Experimental Factor Ontology (EFO) available from http://www.ebi.ac.uk/efo is an application focused ontology modeling the experimental factors in ArrayExpress and constructing mappings to multiple existing domain specific ontologies.
To submit new terms, features or report bugs please submit a ticket at the following: http://www.ebi.ac.uk/panda/jira/secure/CreateIssue!default.jspa