SLC17A7 and Dravet syndrome: Further, murine models of DS suggest 1) that there is an imbalance between hippocampal inhibitory and excitatory inputs[9, 24], 2) there are changes in the levels of the glutamate transporter and vesicular glutamate transporter 1 (VGLUT1)[25] and 3) that there are impairments in signalling mechanisms downstream of the NMDA receptor[26].