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Summary of the gene expression studies Note that Synechocystis PCC 6803 does not survive under nitrogen deprivation, i.e. nitrogen-fixing conditions.
| Cyanobacterium | Gene | nitrogen-fixinga | non-nitrogen-fixinga |
| Synechocystis PCC 6803 | hoxH | lethal | + |
| hoxW | lethal | + | |
| Nostoc punctiforme | hupL | + | - |
| ATCC 29133/PCC 7120 | hupW | + | + |
| Anabaena PCC 7120 | hupL | + | - |
| hupW | + | + | |
| hoxH | + | + | |
| hoxW | + | + | |
a +: expressed, -: not expressed
