Se89-1, or Family with sequence similarity 208 member A, is a human gene encoded by FAM208A. It may also be known as: Protein TASOR; CTCL tumor antigen se89-1; Retinoblastoma-associated protein RAP140; Transgene activation suppressor protein; C3orf63; RAP140; family with sequence similarity 208, member A. The encoded protein has an amino acid length of 1670 and a mass of 189.0 kDa. Other isoforms may exist. Se89-1 is a member of the FAM208 family. Homologs of this gene exist in other organisms, including: Frog.