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Expression of clones homologous to thioredoxin and β-carotene hydroxylase genes during nodulation. Clone 3 is the putative thioredoxin gene and clone 5 the putative β-carotene hydroxylase gene. RNA was extracted from 2-, 7-, and 27-d-old nodules and used as template for semiquantitative RT-PCR. Uninoculated roots served as controls. Ubiquitin primers were used for PCR to ensure use of uniform amounts of templates.
