All KZFPs contain a KRAB domain and an array of zinc fingers. Those are responsible for interacting with the DNA, and in each three amino acids (at positions 6, 3, and -1) are engaged in mediating contacts with DNA. KRAB, Krüppel-associated box; ZF, zinc finger; SCAN, SREZBP, CTfin51, AW-1, and Number 18 cDNA; DUF3669, domain of unknown function 3669.