= Chloroplast intermembrane space
The space between the two <chloroplast envelope> membranes.
It is topologically distinct from both the <chloroplast stroma> and the <thylakoid lumen>. Naming the compartments prevents a transport measurement across one barrier from being mistaken for transport across the entire <chloroplast> membrane system. <Molecular Biology of the Cell, 4th edition by Bruce Alberts and others>[Chapters 12, 18 and 19, compartments, division and cell junctions]{ref}
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