Molecular studies have put this divergence time at around 25 million years.
These two subspecies are now treated as separate species, despite a relatively young divergence time.
Application of molecular clock allowed to estimate divergence times for these groups.
The same data suggest a divergence time for the two species of 12 million years ago.
The genetic distance between the two types is so large that a divergence time of about 1.7 million years has been suggested.
The divergence time of these two species was deemed relatively recent, at around 250 000 years ago.
The divergence time of humans from other apes is of great interest.
If these dates are revised, the divergence times estimated from molecular data will change as well.
However, the relative divergence times are unlikely to change.
This suggested a divergence time around one million years ago.