Additional file 19.

Phylogenetic analysis of NikR. Ni-utilizing organisms are shown in red. Organisms in which nikR gene is located very close to that of either a Ni-related transporter or a Ni-dependent enzyme are shaded. Organisms which do not utilize Ni are shown in black.

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Zhang et al. BMC Genomics 2009 10:78   doi:10.1186/1471-2164-10-78