The VIVIPAROUS (VP1) gene from Zea mays, was the first gene identified with the B3 DNA binding domain, and it, along with its Arabidopsis thaliana ortholog ABSCISIC ACID-INSENSITIVE3 (ABI3). The B3 binding domain present in this family recognizes the Sph/RY element of the CATGCA sequence. Members of this family are involved in the abscisic acid signal transduction pathway, and are involved in seed development, maturation, and germination (PMID:7590227)(PMID:19478073).