phylotree; if ($phylotree->type_id->name != "taxonomy" and $phylotree->has_nodes) { if ($phylotree->type_id and $phylotree->type_id->name == 'polypeptide') { ?>

Phylogenies are essential to any analysis of evolutionary gene sequences collected across a group of organisms. A phylogram is a phylogenetic tree that has branch spans proportional to the amount of character change.