Confocal images showing the colocalization of Tat-Cre-488 with FM4-64 in live 3T3 cells. From left to right: Tat-Cre-488 alone, the fluorescent general marker of endosomes FM4-64 alone and the colocalization of Tat-Cre-488 with FM4-64. Incubation was carried out with 2 µM Tat-Cre-488 and 4 µM of FM4-64. After 8 h cells were washed and images acquired. The fluorescent label used for Tat-Cre is referred as −488. Source: Taken from Wadia et al.¹⁵