Representative confocal images of hippocampal neurons showing membrane penetration of TMR-Tat-P4-(C5)2 and TMR-Tat-C5 (5µM) (magenta), but not the control TMR-C5 (all 20µM). The cell membrane was stained with DiO (grey). Scale bars: 10µm and 5µm on the zooms/orthogonal views. 