Exosome Component 9, or, EXOSC9, is a human gene. Other names include: Exosome complex component RRP45; Autoantigen PM/Scl 1; P75 polymyositis-scleroderma overlap syndrome-associated autoantigen; Polymyositis/scleroderma autoantigen 1; Polymyositis/scleroderma autoantigen 75 kDa; PM/Scl-75; polymyositis/scleroderma autoantigen 1 (75kD); PMSCL1; RRP45; Rrp45p; p6. The encoded protein has an amino acid length of 439 and a mass of 48.9 kDa. Other isoforms may exist. Exosome Component 9 is a member of the RNase PH family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.