Tumor formation assay of MNNG/HOS in vivo.

MNNG/HOS osteosarcoma cells were injected subcutaneously into Balb/C-Nu mice. Numbers indicate tumor bearing/injected mice.将MNNG/HOS骨肉瘤细胞（MNNG/HOS osteosarcoma cells）皮下接种于Balb/C-Nu小鼠（Balb/C-Nu mice）体内，数字代表荷瘤/接种小鼠的数量。