The following DataNodes have no identifier: 3
http://classic.wikipathways.org/instance/WP3130_r128758 http://rdf.wikipathways.org/Pathway/WP3130_r128758/DataNode/e77d7 (CEBPB)
http://classic.wikipathways.org/instance/WP3130_r128758 http://rdf.wikipathways.org/Pathway/WP3130_r128758/DataNode/d71b9 (DEAF1)
http://classic.wikipathways.org/instance/WP3130_r128758 http://rdf.wikipathways.org/Pathway/WP3130_r128758/DataNode/a408c (MAZ)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier