Representative confocal images of hippocampal neurons stained for surface GluA2 (sGluA2, light blue) and internalized GluA2 (iGluA2, red). Treatment with Tat-P4-(C5)2 (20 µM) significantly increases the constitutive, but not PMA induced internalization. Scale bars 10µm. Quantification of iGluA2/sGluA2 within the region of interest for individual neuron (see I, top right corner). Tat-C5 did not increase GluA2 internalization (see Appendix Fig S9D-F). 