Figure 27.35. A phylogenetic tree of three species (1, 2, 3) and the ancestral nodes for common ancestors of 1 and 2 (node O) and all three (node R). The time since the existence of the nodes O and R is labeled t and T, respectively. (Redrawn from Gu X. and Li W-H. Proc. Natl. Acad. Sci. 95: 5899–5905, Fig. 2, © 1998 National Academy of Sciences, USA.)
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