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Schematic illustration of nitrogen fixation in heterocysts and metabolic exchange with neighboring vegetative cells. Fdxred = reduced ferredoxin, Gluc6P = glucose-6-phosphate, 6Pgluc = gluconate-6-phosphate, Rib5P = ribulose-5-phosphate, GOGAT = glutamate synthase, PSI = photosystem I, and PSII = photosystem II.
