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A working model of GmPHR-GmPHT1 modules in soybean nodules. Double vertical lines separate the non-N2-fixing region (left) from the N2-fixing region (right). The arrows indicate enhanced effects, and dashes indicate repressed effects. Black lines indicate the results in our study, while gray lines denote unidentified factors and their effects in our study. Question marks indicate unknown factors (see the text for details).
