The following DataNodes have no identifier: 1
http://classic.wikipathways.org/instance/WP3882_r117017 http://rdf.wikipathways.org/Pathway/WP3882_r117017/DataNode/f1b7e (K Channels)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier