5FXG:
reference: Activation of NMDA receptors and the mechanism of inhibition by ifenprodil., Tajima N, Karakas E, Grant T, Simorowski N, Diaz-Avalos R, Grigorieff N, Furukawa H, Nature. 2016 May 2. doi: 10.1038/nature17679. PMID: 27135925

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