Yang, Z. and D. Roberts (1995). On the use of nucleic acid sequences to infer early branchings in the tree of life. Molecular Biology and Evolution 12(3), 451–458. Yap, V. B. and L. Pachter (2004). Identification of evolutionary hotspots in the rodent genomes. Genome Research 14(4), 574–579. Yap, V. B. and T. Speed (2005). Rooting a phylogenetic tree with nonreversible substitution models. BMC Evolutionary Biology 5, 2. Zou, L., E. Susko, C. Field, and A. J. Roger (2011). The parameters of the Barry and Hartigan general Markov model are statistically nonidentifiable. Systematic Biology 60(6), 872–5. 29