The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP3227_r117637 http://rdf.wikipathways.org/Pathway/WP3227_r117637/DataNode/d20e2 (KCNIP3)
http://classic.wikipathways.org/instance/WP3227_r117637 http://rdf.wikipathways.org/Pathway/WP3227_r117637/DataNode/f526f (PIK3R2)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier