 Using the molecular clock the authors estimated that gorillas split up first 6.2-8.4 MYA and chimpanzees and humans split up 1.6-2.2 million years later (internodal time span) 4.6-6.2 MYA.The internodal time span is useful to estimate the ancestral effective population size of the common ancestor of humans and chimpanzees.A parsimonious analysis revealed that 24 loci supported the "Homo"-"Pan" clade, 7 supported the "Homo"-"Gorilla" clade, 2 supported the "Pan"-"Gorilla" clade and 20 gave no resolution.