The following DataNodes have no identifier: 4
http://classic.wikipathways.org/instance/WP4233_r117644 http://rdf.wikipathways.org/Pathway/WP4233_r117644/DataNode/e1fb0 (AA-GSH)
http://classic.wikipathways.org/instance/WP4233_r117644 http://rdf.wikipathways.org/Pathway/WP4233_r117644/DataNode/ad4d0 (GA-GSH)
http://classic.wikipathways.org/instance/WP4233_r117644 http://rdf.wikipathways.org/Pathway/WP4233_r117644/DataNode/f3a4a (N3-GA-Adenosine)
http://classic.wikipathways.org/instance/WP4233_r117644 http://rdf.wikipathways.org/Pathway/WP4233_r117644/DataNode/d6e01 (N7-GA-Guanine)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier