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Nitrogen assimilation in alfalfa root nodule and the cellular localization of the enzymes involved. Two linked Glu cycles are proposed to be involved in the production of Asn. Cycle 1, Cytosolic Glu cycle; cycle 2, amyloplast Glu cycle. Metabolites involved are NH4+, Gln, Glu, 2-oxoglutarate, oxaloacetate, Asp, and Asn.
