GluN1 (GRIN1) binds to GluN2B (GRIN2B) and GluN3B (GRIN3B) to form a tri-heteromeric NMDA receptor GluN1:GluN2B:GluN3B (GRIN1:GRIN2B:GRIN3B) (Yamakura et al. 2005).
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