A team in China has been experimenting with a protein called Neuropsin and it's link to human brain development. The protein comes in two flavors Neuropsin I (the short version) and Neuropsin II (the longer version). The theory behind the Chinese experiment is that a genetic mutation allows the body to produce the longer version. Neuropsin is thought to be a key protein in the learning and memory functions of the human brain. The experiments spliced a section of human DNA in chimps, with this new DNA the chimps did indeed start to produce the protein.