This gene is a member of the peptidase C19 family and encodes a protein that is similar to ubiquitin-specific proteases. Though this gene is located on the X chromosome, it escapes X-inactivation. Mutations in this gene have been associated with Turner syndrome. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. Synonyms: Polyclonal USP9X antibody, Anti-USP9X antibody, ubiquitin specific peptidase 9, X-linked antibody, DFFRX antibody, FAF antibody, FAM antibody.