Involved in the modulation of neuronal aggregation (PubMed:8743952). May be involved in developmental events during the formation of the central nervous system (PubMed:11008217). Subcommissural organ. Located at the boundary of the diencephalon and mesencephalon beneath the posterior commissure at the point where the axons cross the midline. Embryo. Belongs to the thrombospondin family.