Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP55_r128026](http://classic.wikipathways.org/instance/WP55_r128026) 'Steroid biosynthesis' in Mus musculus has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference