Morphology observation of CAFSCs subculture. A, nest clone that cultured for 24 h, cells are more toward the center more densely populated, which show a strong proliferation ability; B, nest clone has been passaged and cells evenly distribute, cell morphology comes to the development of fibrosis, strong refraction, full cells, and stronger stereo sense; C, P8 of CAFSCs before passage, which cells grew densely; D, P20 of CAFSCs after passage for 1 d.