Found 1 pathways with zero (PubMed) references
* [http://classic.wikipathways.org/instance/WP57_r117945](http://classic.wikipathways.org/instance/WP57_r117945) 'Signal transduction of S1P receptor' in Mus musculus has zero references;
More details at https://www.wikipathways.org/WikiPathwaysCurator/ReferencesTests/atLeastOneReference