Table 3 Measurement of intracellular iron content. Nostoc wild type strain was grown in presence of nitrate (BG11) or in combined nitrogen depleted medium (BG11o), or exposed to peroxide stress after nitrogen step down (BG11o H₂O₂) (see Experimental procedures), before the measurements were carried out. The results are the means of three independent experiments. The standard deviations are indicated

From: The Pkn22 Ser/Thr kinase in Nostoc PCC 7120: role of FurA and NtcA regulators and transcript profiling under nitrogen starvation and oxidative stress