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Localization of NADH-GOGAT transcript in effective and plant-gene-controlled ineffective alfalfa nodules during development. Longitudinal sections through effective (A–H) and plant-controlled ineffective (I–T) alfalfa root nodules. The bright-field and dark-field image pairs are of 7- (A, B, I, and J), 9- (C, D, K, L, M, and N), 19- (E, F, O, P, Q, and R), and 33- (G, H, S, and T) d-old root nodules. Bars = 400 μm.
