Green algae and plants are believed to be descendents of the original plastid-harboring eukaryote. However, some protists contain plastids that are believed to be from other eukaryotes. These protists have within their endoplasmic reticulum an endosymbiont resembling a eukaryote. This endosymbiont possesses its own plasma membrane and ribosomes (which are both similar to those of eukaryotes) as well as the remnant of a nucleus containing its own DNA (a nucleomorph), and finally plastids. Thus, these organisms have four sets of DNA: mitochondrial, plastid, nuclear, and nucleomorph. Some protists may even contain plastids from tertiary endocytosis.
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