Divergence in metabolite abundance on the human and chimpanzee lineages. The trees are based on the abundance measurements of (a) 9 metabolites with significant concentration difference between human controls and schizophrenia patients and (b) 12 metabolites with no difference between these two groups. The trees were built using a neighbor-joining algorithm.
Khaitovich et al. Genome Biology 2008 9:R124 doi:10.1186/gb-2008-9-8-r124