Immunocompetent mice injected with adipose-derived stromal/stem cells in suspension and in spheroids. Tissues harvested on days 3, 10 and 21 are represented in different rows. First column, photographs on gross inspection (arrows indicate injection sites); second column, hematoxylin and eosin (H & E)-stained sections; third column, fluorescent images of same sections. Scale bar on lower right corner: 200 μm. ASC, adipose-derived stromal/stem cell.