var render = function (div) {
    "use strict";

    var internal_label = tnt.tree.label.text()
        .text(function (node) {
            return node.data().branch_length;
        })
        .fontweight("bold")
        .fontsize(13)
        .color("red")
        .transform(function (node) {
            return {
                "translate" : [-50, -5],
                "rotate" : -0
            };
        });

    var leaf_label = tnt.tree.label.text()
        .fontsize(14);

    var node_label = tnt.tree.label()
        .width(leaf_label.width())
        .height(30)
        .display(function (node) {
            if (node.is_leaf()) {
                return leaf_label.display().call(this, node, "vertical");
            } else {
                return internal_label.display().call(this, node, "vertical");
            }
        })
        .transform(function (node) {
            if (node.is_leaf()) {
                return leaf_label.transform().call(this, node, "vertical");
            } else {
                return internal_label.transform().call(this, node, "vertical");
            }
        });

    var tree = tnt.tree();
    tree
        .data (tnt.tree.parse_newick(newick))
        .label (node_label)
        .layout(tnt.tree.layout.vertical()
            .width(950)
            .scale(true)
        );

    tree(div);
};

var newick = "(((Crotalus_oreganus_oreganus_cytochrome_b:0.00800,Crotalus_horridus_cytochrome_b:0.05866):0.04732,(Thamnophis_elegans_terrestris_cytochrome_b:0.00366,Thamnophis_atratus_cytochrome_b:0.00172):0.06255):0.00555,(Pituophis_catenifer_vertebralis_cytochrome_b:0.00552,Lampropeltis_getula_cytochrome_b:0.02035):0.05762,((Diadophis_punctatus_cytochrome_b:0.06486,Contia_tenuis_cytochrome_b:0.05342):0.01037,Hypsiglena_torquata_cytochrome_b:0.05346):0.00779);";