Abstract
Mitochondrial DNA (mtDNA) polymorphisms in four species of macaques, i.e., Japanese monkey (Macaca fuscata), rhesus monkey (M. mulatta), Formosan monkey (M. cyclopis), and crab-eating monkey (M. fascicularis), were analyzed to study phylogenetic relationships. When 17 restriction enzymes of 6-bp recognition were used, 42-49 sites were observed in the samples. The estimated number of nucleotide substitutions per site among Japanese, rhesus, and Formosan monkeys ranges from 0.0318 to 0.0396, and that between the crab-eating monkey and the other monkeys from 0.0577 to 0.0653. These findings suggest that the crab-eating monkey diverged from the other three approximately 1.5-3.0 Myr before the present (Mybp) and that the Japanese, rhesus, and Formosan monkeys diverged approximately 0.9-1.8 Mybp, although the branching order cannot be determined conclusively.
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