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In situ localization of the NADH-GOGAT, nifH, and leghemoglobin transcripts in 33-d-old alfalfa root nodules using serial sections. The bright-field and dark-field image pairs are of longitudinal sections through 33-d-old root nodules that were hybridized with 35S-labeled NADH-GOGAT (A and B), leghemoglobin (C and D), or nifH (E and F) antisense RNA probe. Bars = 400 μm.
