The following DataNodes have no identifier: 2
http://classic.wikipathways.org/instance/WP3652_r129298 http://rdf.wikipathways.org/Pathway/WP3652_r129298/DataNode/bc8e9 (BMP Pathway)
http://classic.wikipathways.org/instance/WP3652_r129298 http://rdf.wikipathways.org/Pathway/WP3652_r129298/DataNode/f7fcf (Cell Growth)
More details at https://www.wikipathways.org/WikiPathwaysCurator/DataNodesTests/dataNodesWithoutIdentifier