The VEFS-Box (VRN2-EMF2-FIS2-Su(z)12) box is the C-terminal region of these proteins, characterised by an acidic cluster and a tryptophan/methionine-rich sequence, the acidic-W/M domain [1]. Some of these sequences are associated with a zinc-finger domain about 100 residues towards the N-terminus. This protein is one of the polycomb cluster of proteins which control HOX gene transcription as it functions in heterochromatin-mediated repression [2].

1: EMBRYONIC FLOWER2, a novel polycomb group protein homolog, mediates shoot development and flowering in Arabidopsis. Yoshida N, Yanai Y, Chen L, Kato Y, Hiratsuka J, Miwa T, Sung ZR, Takahashi S; Plant Cell. 2001;13:2471-2481. PMID:11701882

2: Su(z)12, a novel Drosophila Polycomb group gene that is conserved in vertebrates and plants. Birve A, Sengupta AK, Beuchle D, Larsson J, Kennison JA, Rasmuson-Lestander A, Muller J; Development. 2001;128:3371-3379. PMID:11546753