This is a control inactive peptide used as a mutant counterpart to glutamate receptor endocytosis inhibitor (GluR23Y), connected to an 11 amino acid cell permeable HIV Trans-Activator of Transcription (TAT) protein transduction domain (PTD). GluR23A is derived from GluR23Y amino acids 869 to 877, with Ala substituted for Tyr, and thus lacking essential phosphorylation sites.