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(A and B) Fluorescence microscopy of GFP in little spheres (left panel) and large spheres (right panel) of 143B cells (A) and K7M2 cells (B). (C and D) Stem-cell colony-formation assays with 143B cells (C) and K7M2 cells (D). Data are the mean ± SD from 3 independent cultures of 143B cells and 4 independent cultures of K7M2 cells compared by 2-tailed Student’s t test. Scale bars: 1,000 μm.
