Immunocompromised mice injected with live and nonviable adipose-derived stromal/stem cell suspensions. Top row: immunocompromised mice injected with live adipose-derived stromal/stem cell (ASC) cell suspensions harvested on day 3. First column, images with DiI dye (red); second column, sections with Mac-2 stain (Alexa 488; green); third column, images with DAPI 4′,6-diamidino-2-phenylindole (DAPI; blue); fourth column, merged fluorescent images of the same sections. Middle row: nonviable ASC cell suspensions injected into immunocompromised mice and harvested on day 3. Bottom row: non-injected control tissue from immunocompromised mice. Scale bars: 50 μm.