The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP5390_r126766 http://rdf.wikipathways.org/Pathway/WP5390_r126766/DataNode/cd8b1 (LOC400573)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier