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Expression of ohr and ohrR in planta. Nodules were fixed and stained with 5-bromo-4-chloro-3-indolyl-beta-D-galactopyranoside (β-galactosidase detection) (a,c) or 5-bromo-4-chloro-3-indolyl-beta-D-glucuronate (β-glucuronidase detection) (b, d) and visualised by light microscopy. (a, b) whole nodules, (c, d) thin sections of stained nodules. The images are representative of 30 nodules analysed.
