I understand that many curated trees of life already exist (eg http://tolweb.org/tree/) but is there any website that allows one to input a list of organisms, and then produce the current best guess at their evolutionary relationships?
The best site I managed to find so far is http://itol.embl.de/itol.cgi, which allows you to select specific species from the main tree to plot into a sub-tree, but the tree itself is rather small, so more detailed comparisons cannot be made.
Answer
http://phylot.biobyte.de/ performs the requisite task (generating a phylogenetic tree based on the specific organisms provided, using the NCBI taxonomy tables).
For example, the input of tree elements
Trichomonas vaginalis,Trypanosoma brucei,Homo sapiens,Fibroporia radiculosa,Paramecium tetraurelia,Tetrahymena thermophila,Cryptosporidium muris,Cryptosporidium hominis,Blastocystis hominis
generates the tree
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