叶绿体是植物细胞内的一种重要细胞器，它起源于早期具有光合能力的原核生物与真核生物的内共生事件。
Plastids are essential organelles of plant cells and it is believed that plastids have arisen from an endosymbiotic event between a protoeukaryote and a photosynthetic prokaryote.
最近德国微生物学家发现在酵母细胞内小的活动细菌（孢内共生物）。
More recently a German microbiologist discovered small mobile bacteria inside the yeast cells (endosymbionts).
最近德国微生物学家发现在酵母细胞内小的活动细菌（孢内共生物）。
More recently a German microbiologist discovered small mobile bacteria inside the yeast cells (endosymbionts).
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