Figure 1

Average volumes of tumor driven from the primary generation, the first generation and the second generation of testicular yolk sac tumor (TYST) cells were compared with the number of cell cycles (A). The tumor was formed from the generation four of TYST cells and on after the subcutaneous transplantation (B). Histogram of tumor formed from cloned TYST cells stained with HE (C, × 400). Ultrastructure of cloned TYST cells with basement membrane materials, oval and enlargement nuclei, and glandular-like structures between cells (D, × 5000).