The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP4863_r124639 http://rdf.wikipathways.org/Pathway/WP4863_r124639/DataNode/bf53b (nsp567)
http://classic.wikipathways.org/instance/WP4863_r124639 http://rdf.wikipathways.org/Pathway/WP4863_r124639/DataNode/d00ed (nsp567)
http://classic.wikipathways.org/instance/WP4863_r124639 http://rdf.wikipathways.org/Pathway/WP4863_r124639/DataNode/a3e06 (nsp6)
http://classic.wikipathways.org/instance/WP4863_r124639 http://rdf.wikipathways.org/Pathway/WP4863_r124639/DataNode/a6214 (nsp6)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier