#NEXUS
[Example rooted phylogenetic tree with branch lengths; same topology as the Newick and phyloXML examples.]

Begin taxa;
    Dimensions ntax=9;
    Taxlabels Human Chimpanzee Gorilla Orangutan Gibbon Mouse Rat Chicken Lizard;
End;

Begin trees;
    Translate
        1 Human,
        2 Chimpanzee,
        3 Gorilla,
        4 Orangutan,
        5 Gibbon,
        6 Mouse,
        7 Rat,
        8 Chicken,
        9 Lizard;
    Tree example_tree = [&R] ((1:0.12,2:0.10):0.08,(3:0.15,(4:0.18,5:0.20):0.07):0.06,((6:0.22,7:0.21):0.09,(8:0.30,9:0.28):0.11):0.10);
End;