This is the first time that genomes have been transferred between branches of life—from a prokaryote to eukaryote and back to a prokaryote.

这是第一次从原核到真核再到原核生物的跨生物种类的基因组转移。

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.

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。

Serine hydroxymethyltransferase(SHMT) is widely distributed in nature, being found in prokaryote and eukaryote and catalyzes the reversible interconversion of serine and glycine.

丝氨酸羟甲基转移酶（SHMT）在自然界中普遍存在，它的生理学功能是催化丝氨酸和甘氨酸之间可逆的互换。