PLXDC2 (Plexin-domain containing 2), also named tumor endothelial marker 7-related protein (TEM7R), is a single-pass type I membrane protein with some homology to nidogen and to plexins. PLXDC2 is located in tumor endothelium and plays a role in tumor angiogenesis. Three isoforms of PLXDC2 produced by alternative splicing have been described. Recent finding revealed that PLXDC2 is a mitogen for neural progenitors and functions as a novel regulator of the development of different brain regions, suggesting its role in coordinating proliferation and differentiation in the developing nervous system.