The following DataNodes have no identifier: 3
http://classic.wikipathways.org/instance/WP1050_r117036 http://rdf.wikipathways.org/Pathway/WP1050_r117036/DataNode/de0 (GPX1)
http://classic.wikipathways.org/instance/WP1050_r117036 http://rdf.wikipathways.org/Pathway/WP1050_r117036/DataNode/aa7 (MT1X)
http://classic.wikipathways.org/instance/WP1050_r117036 http://rdf.wikipathways.org/Pathway/WP1050_r117036/DataNode/ed6 (UGT1A6)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier