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Chondroitin sulfate proteoglycan 4, also known as melanoma-associated chondroitin sulfate proteoglycan （MCSP） or neuron-glial antigen 2 （NG2）, is a chondroitin sulfate proteoglycan that in humans is encoded by the CSPG4 gene. CSPG4 plays a role in stabilizing cell-substratum interactions during early events of melanoma cell spreading on endothelial basement membranes. It represents an integral membrane chondroitin sulfate proteoglycan expressed by human malignant melanoma cells. CSPG4/NG2 is also a hallmark protein of oligodendrocyte progenitor cells （OPCs） and OPC dysfunction has been implicated as a candidate pathophysiological mechanism of familial schizophrenia. The researchers also demonstrate that the induced pluripotent stem cells （iPSCs）-derived OPCs from CSPG4A131T mutation carriers exhibited abnormal post-translational processing, subcellular localization of the mutant NG2 protein, aberrant cellular morphology, and a decreased cell viability and myelination potential.