 When the draft sequence of the common chimpanzee ("Pan troglodytes") genome was published in the summer 2005, 2400 million bases (of ~3160 million bases) were sequenced and assembled well enough to be compared to the human genome.1.23% of this sequenced differed by single-base substitutions.Of this, 1.06% or less was thought to represent fixed differences between the species, with the rest being variant sites in humans or chimpanzees.