This web page will construct a phylogenetic tree of the creatures you select below. It will use the DNA sequences
of the hemagglutinin HA4 from each of these strains of influenza to construct the tree.

1. Select the desired creatures from the lists below.
• To select more than one in the same list, hold down the apple key (on macs); the control key (on pcs); on the Suns, you just click.
• If you want to clear your selections and start over, click the "Clear all selections" button.
2. You must also choose one and only one outgroup organism so that your tree will have a root. This is especially important for the parsimony analysis. The outgroup organism should not be closely related to the other organisms.
3. When you have made the selections you want, click the "calculate tree" button.
4. Your request will then be processed this may take a while so please be patient.