The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP1011_r117623 http://rdf.wikipathways.org/Pathway/WP1011_r117623/DataNode/cb7e0 (GAB2)
http://classic.wikipathways.org/instance/WP1011_r117623 http://rdf.wikipathways.org/Pathway/WP1011_r117623/DataNode/dbdf8 (PIK3R2)
http://classic.wikipathways.org/instance/WP1011_r117623 http://rdf.wikipathways.org/Pathway/WP1011_r117623/DataNode/cf657 (TRA@)
http://classic.wikipathways.org/instance/WP1011_r117623 http://rdf.wikipathways.org/Pathway/WP1011_r117623/DataNode/ef2e0 (TRB@)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier