There were papillae, microvilli or microvesicles on the surface of some cells.Less or more mitochondria, endoplasmic reticula, ribosomes and glycogen granules existed in the cytoplasm.

• 其中线粒体超微结构的变化可以作为评判培养条件优劣的一个指标.；核常呈圆形；核膜为一单位膜；核孔清晰;