The Chimpanzee Genome Project was an effort to determine the DNA sequence of the chimpanzee genome. Sequencing began in 2005 and by 2013 twenty-four individual chimpanzees had been sequenced. This project was folded into the Great Ape Genome Project. The research showed considerable genome diversity in chimpanzees with many population-specific traits. The central chimpanzees retain the highest diversity in the chimpanzee lineage, whereas the other subspecies demonstrate signs of population bottlenecks.