The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP3162_r117629 http://rdf.wikipathways.org/Pathway/WP3162_r117629/DataNode/d140a (alpha-globulin)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier