Fig. 3From: The model cyanobacteria Anabaena sp. PCC 7120 possess an intact but partially degenerated gene cluster encoding gas vesiclesExpression levels of gvpA under different growth conditions detected by real-time PCR. Each histogram represents the average value of triplicate experiments, and a two-tailed Student’s t test was used for the comparison of statistical significance (**P < 0.01)Back to article page