I have constructed Neighbor- Joinning tree using mtDNA D-loop sequences from 92 horses using MEGA 7. The dendrogram obtained is so conjested and the sequences unreadable. How do I make the sequences in the clusters readable?
Unfortunately the graphic editing capabilities of MEGA is rather limited. I recommend to save your tree in Newick format and edit it in FigTree (http://tree.bio.ed.ac.uk/software/figtree/). It has all the options you need to make your tree readable.