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Fluid volume found interior of the inner membrane in chloroplasts within which thylakoids are suspended.
The stroma is equivalent, indeed homologous to the cytoplasm found within Gram-negative bacteria or, evolutionarily even closer, that of cyanobacteria. Also equivalent is the mitochonrial matrix.
It is within the stroma that the dark reaction of photosynthesis, i.e., the Calvin cycle, takes place.
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