I needed to generate some ultrametric Newick trees for some simulations. There's a nice Newick tree generator online at http:/Trex/trex.uqam.ca/index.php?action=randomtreegenerator&project=trex, but it doesn't have any way to make an ultrametric tree. (Ultrametric means that the lengths from root to tip are all of the same.) So I put together a short script using BioPython to replace the length of each leaf node to make the lengths all identical to the longest length.
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