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(A) Schematic map of plasmid pOPS0379 containing sfGFP gene under the control of nifH gene promoter (PnifH). Pea nodules formed by Rlv384[pOPS0379], (B,C) bright-field, (D,E) fluorescence (GFP filter), and (F,G) merged images. GFP expression is observed in the nitrogen-fixing zone.
