The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP1020_r125343 http://rdf.wikipathways.org/Pathway/WP1020_r125343/DataNode/baf (ACACA)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier