BORIS, or CCCTC-binding factor (zinc finger protein)-like, is a human gene encoded by CTCFL. It may also be known as: Transcriptional repressor CTCFL; Brother of the regulator of imprinted sites; CTCF paralog; CTCF-like protein; Cancer/testis antigen 27; CT27; Zinc finger protein CTCF-T; CTCF-T; dJ579F20.2. The encoded protein has an amino acid length of 663 and a mass of 75.7 kDa. Other isoforms may exist. BORIS is a member of the CTCF zinc-finger protein family. Homologs of this gene exist in other organisms, including: Mouse, Rat.