The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP3655_r129299 http://rdf.wikipathways.org/Pathway/WP3655_r129299/DataNode/b3278 (Cell Migration)
http://classic.wikipathways.org/instance/WP3655_r129299 http://rdf.wikipathways.org/Pathway/WP3655_r129299/DataNode/a042f (EMT)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier