obsolete signal transducer activity https://github.com/geneontology/go-ontology/issues/14232 true hematopoietin/interferon-class (D200-domain) cytokine receptor signal transducer activity GO:0009370 OBSOLETE. Conveys a signal across a cell to trigger a change in cell function or state. A signal is a physical entity or change in state that is used to transfer information in order to trigger a response. This term was obsoleted because it was not clearly defined and is not a useful grouping term. GO:0005062 quorum sensing signal generator activity molecular_function GO:0009369 GO:0004871 quorum sensing response regulator activity