p5, Figure 1; Figure 1 was reproduced by using the UPGMA clustering method instead of the NJ clustering method according to the suggestion of the reviewer, then, NitM from α-cyanobacteria and β-cyanobacteria form clearly distinct groups. “using the UPGMA (Unweighted Pair Group Method with Arithmetic mean) clustering method of ClustalX.” was added in the legend of Figure 1.
entitled “Functional Characterization of the FNT Family Nitrite Transporter of Marine Picocyanobacteria” is a very interesting piece of work since it shows the functional characterization as nitrite transporter of several nitM proteins from different picocyanobacteria, showing also fruitful comparisons of their sequences that lead to characterize the c-terminal region of a-cyanobacterial NitM proteins as an inhibitory domain of nitrite transport.