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Table 3 Summary of the gene expression studies Note that Synechocystis PCC 6803 does not survive under nitrogen deprivation, i.e. nitrogen-fixing conditions.

From: Presence and expression of hydrogenase specific C-terminal endopeptidases in cyanobacteria

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 + +
  1. a +: expressed, -: not expressed