F ig . 1 samp le p repared by h igh p ressure freezing and freeze subst itut ion ( s . sheath ) 图1经高压冷冻固定和冷冻置换制备的发菜营养细胞( s .胶质鞘) 。
2.
Methods : the sartorius muscle was processed by conventional chemical fixation and cryofixation followed by freezing substitution 方法：蟾蜍缝匠肌经常规化学固定以及超低温快速冷冻固定、冷冻置换后，透射电镜进行超微结构观察。
