Inactive pollen tube attractants guiding pollen tubes to the ovular micropyle. found at the micropylar end of the female gametophyte, possibly at the filiform apparatus of the synergid cell. Difuses to the surface of the funiculus of the ovule through the micropyle. Expressed in the pistil. Detected exclusively in the synergid cells. Belongs to the DEFL family. Lacks 2 of the 4 disulfide bonds, which are conserved features of the family.