Protein vs organism phylogenies. Averaged and binned mean depth for organisms in TreeBASE (solid squares) and for protein phylogenies in PANDIT (empty circles). Where the error bars are not visible we have that the standard error for the mean depth is smaller than the symbol size.
Herrada et al. BMC Evolutionary Biology 2011 11:155 doi:10.1186/1471-2148-11-155