Bgee is a database at SIB Swiss Institute of Bioinformatics and University of Lausanne to retrieve and compare gene expression patterns in multiple animal species, produced from multiple data types (RNA-Seq, Affymetrix, in situ hybridization, and EST data) and from multiple data sets (including GTEx data). SIMPLY NORMAL Bgee is based exclusively on curated "normal", healthy, expression data (e.g., no gene knock-out, no treatment, no disease), to provide a comparable reference of normal gene expression. COMPARABLE BETWEEN SPECIES Bgee produces calls of presence/absence of expression, and of differential over-/under-expression, integrated along with information of gene orthology, and of homology between organs. This allows comparisons of expression patterns between species. *To see the original sources of images used in the Bgee LinkedIn page, please visit https://bgee.org and check the bottom of this page. Please do not reproduce them without properly citing the original sources.