叶绿体是植物进行光合作用的细胞器，“内共生学说”认为叶绿体起源于蓝藻类的原核生物。
Chloroplast is an organelle specialized for carrying out photosynthesis in plants and descended from cyanobacteria according to endosymbiosis.
有趣的是，迁移至植物核内的内共生蛋白会变得比蓝藻直系同源还要大。
Interestingly, endosymbiotic proteins that migrated to the plant nucleus became larger than their cyanobacterial orthologs.
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