Fig. 1.

Phase contrast microscopy showing multipotent cells obtained as adherent cells twenty-four hours after plating. Traumatized muscle-derived multiprogenitor cells (A) and bone marrow-derived mesenchymal stem cells (B) were plated, and, after two hours, the cultures were washed extensively with phosphate-buffered saline solution. Cells were visualized with phase contrast microscopy after twenty-four hours. The morphology of many of the muscle-derived cells is spindle-shaped and elongated, similar to that of bone marrow-derived mesenchymal stem cells. Bar = 100 μm.