The following DataNodes have no identifier: 3
http://classic.wikipathways.org/instance/WP3213_r107069 http://rdf.wikipathways.org/Pathway/WP3213_r107069/DataNode/a4afa (GAB2)
http://classic.wikipathways.org/instance/WP3213_r107069 http://rdf.wikipathways.org/Pathway/WP3213_r107069/DataNode/d40f5 (IRF9)
http://classic.wikipathways.org/instance/WP3213_r107069 http://rdf.wikipathways.org/Pathway/WP3213_r107069/DataNode/ef59a (PIK3R2)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier