Hsd17b9 is an alias for the gene, Retinol dehydrogenase 5 (11-cis/9-cis), in humans. Other names include: 11-cis retinol dehydrogenase; 11-cis RoDH; 9-cis retinol dehydrogenase; 9cRDH; Retinol dehydrogenase 5; Short chain dehydrogenase/reductase family 9C member 5; 11-cis RDH; short chain dehydrogenase/reductase family 9C, member 5; HSD17B9; RDH1; SDR9C5. The encoded protein is an enzyme with an amino acid length of 318 and a mass of 35.0 kDa. Hsd17b9 is a member of the Short-chain dehydrogenases/reductases (SDR) family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.