Methods: Electron microscopic technique was utilized in this study.

方法：采用半薄切片光镜观察、超薄切片电镜观察。

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Methods: Routine electron microscopic technique and cytochemical methods of hydrogen peroxide were performed.

方法：应用了常规电镜技术及过氧化氢细胞化学方法。

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Methods: Special stainings of toluidine blue, Alcian blue and electron microscopic technique were used in the study.

方法：采用甲苯胺蓝、爱尔沙蓝特殊染色法及电子显微镜技术。

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