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Comparison of the zinc cluster and putative linker and dimerization domains of the NirA and Nit4 proteins. The NirA and Nit4 sequences were described previously (5, 35). The putative dimerization domains shown for NirA (A and B) are those predicted by Schjerling and Holmberg (30). Numbers indicate the positions of residues in the translated protein sequences in the above-mentioned references.
