Proteoglycan that seems to be implicated in diverse developmental roles such as differentiation, cell-cell recognition, embryogenesis and programmed cell death. Expressed in reproductive tissues. Expressed in chalaza, funiculus, stigma, septum, style and transmitting tract. Contains 4-hydroxyproline; hydroxylated on Pro-32, Pro-34 and Pro-36. O-glycosylated on hydroxyprolines; noncontiguous hydroxylproline residues are glycosylated with arabinogalactan. Belongs to the AG-peptide AGP family.