Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP238_r117579](http://classic.wikipathways.org/instance/WP238_r117579) 'Osteoblast signaling' in Mus musculus has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference