Methods: The morphology of HSF was observed under an electron microscope. The cell cycle was analyzed with flow cytometry. 3H TdR uptake was tested with isotope labeled method.

• 方法电镜观察细胞形态,流式细胞仪测定细胞周期,同位素放射测定3H胸腺嘧啶核苷(3HTdR)摄取量。