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Diagram of Nif-proteins participation in the formation of active nitrogenase in A. vinelandii. The function of Nif proteins has been reviewed recently (Rubio and Ludden, 2008). Color code: red, NifDK polypeptides; blue, NifH polypeptides; green, ClpX2; yellow, ClpX2 targets; black, other proteins involved in nitrogenase assembly.
