http://purl.obolibrary.org/obo/uberon/bridge/collected-vhog http://uberon.org http://bgee.unil.ch/bgee/bgee http://www.ncbi.nlm.nih.gov/pubmed/22285560 http://purl.obolibrary.org/obo/uberon/references/reference_0000027 http://genomebiology.com/2012/13/1/R5 VHOG, Uberon and Phenoscape editors Uberon importer for vHOG homologous groupings