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Paste your sequences in the Phylip format
(no spaces in the species names; at least one space is required in the end of a species name) into the window :

File Pasted

Data example in the relaxed interleaved Phylip format
Data example in the sequential Phylip format


Email address (required field with bootstrap option; the results will be also sent to you by email)

Input Data
Data Type
Input sequences: interleaved or sequential

Substitution Model
Substitution model
Optimize equilibrium frequencies
Ts/tv ratio
Proportion of invariable sites
One category of substitution rate
Number of relative substitution rate categories
Gamma distribution parameter
'Middle' of each rate class

Tree Searching
Optimize tree topology with branch lengths
Starting tree
Starting tree file
Tree topology search operations

Branch Support
Non parametric bootstrap analysis replicates
Approximate likelihood ratio test

“A simple, fast and accurate algorithm to estimate large phylogenies by maximum likelihood” Guindon S., Gascuel O. Systematic Biology 52(5):696-704

This site has been visited 602038 times since Friday, November 25, 2005.

Boc, A., Diallo, Alpha B. and Makarenkov, V. (2012), T-REX: a web server for inferring, validating and visualizing phylogenetic trees and networks, Nucleic Acids Research, 40(W1), W573-W579.

Copyright © 2005 Université du Québec à Montréal (UQAM)
Webmasters : Alix Boc and Alpha Boubacar Diallo