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.
Round 1: and Author Response I found this research interesting, relevant and novel.