FIG. 2.

Cross-hybridization experiments using four targets hybridized individually at different stringencies to test arrays composed of 21 diverse nifH probes. Relative hybridization signal is plotted against percent sequence identity between probe and target. The source organisms for the targets are shown in each graph. Symbols indicating formamide concentrations are the same for all panels. The 10% formamide treatment was performed only with the Nostoc muscorum target.