Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP1398_r117933](http://classic.wikipathways.org/instance/WP1398_r117933) 'GPCRs, orphan' in Mus musculus has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference