Almost all chloroplasts are thought to derive directly or indirectly from a single endosymbiotic event. Mitochondria also derive from symbiosis, but chloroplasts are found only in plants and protista. The chloroplast is surrounded by a double-layered composite membrane with an intermembrane space; further, it has reticulations, or many infoldings, filling the inner spaces. The chloroplast has its own DNA, which codes for redox proteins involved in electron transport in photosynthesis.= = = Medical Renaissance = = =
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