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Sequence alignment of Synechocystis PCC6803 NifU and the corresponding C-terminal regions of NifU-like domains of human NFU and A. vinelandii NifU. The show 43% sequence identity with A. vinelandii and 46% sequence identity with human NFU. Sequence similarity is indicated by (+). The conserved C-X-X-C motif shown to ligate [Fe-S] clusters is highlighted by bold underlined red Cys.
