Able to repress WUS when constitutively overexpressed, but have no effect on CLV3. Expressed in the shoot apex, stamens, young leaves and young siliques, but not in old leaves. Detected in provascular and vascular tissue, but not in the vegetative meristem. In inflorescences, restricted to the vasculature and absent from young flowers, except from anthers. Expressed throughout development. Decreased expression in the shoot apex during the transition to flowering. Expressed in developing embryos from the early heart stage until torpedo stage. No visible phenotype; due to the redundancy with other FAF genes. Belongs to the fantastic four family.