Subsequent analyses based on the prototype mAbs 2161F9 and 2161D7 and other clones belonging to the same groups showed that both the developing brain and glioblastoma lesions embodied vessels made up of pericytes expressing more than one molecular form of NG2/CSPG4, and thereby discerned as discrete subsets. The gene discussed is CSPG4; the disease is glioblastoma.