the Kazakh Veterinary-Zootechnical Institute and died of a stroke two years later. In the 1970s, a performing chimpanzee named Oliver was popularized as a possible "mutant" or even a human–chimpanzee hybrid. Claims that Oliver had 47 chromosomes—midpoint between the normal 46 for humans and 48 for chimpanzees—were disproven after an examination of his genetic material at the University of Chicago in 1996. Oliver's cranial morphology, ear shape, freckles, and baldness fall within the range of variability exhibited by the common chimpanzee. Results of further studies with Oliver were published in the American Journal of Physical Anthropology. In the 1980s, there were reports of an experiment in human–chimpanzee crossbreeding conducted in China in 1967, and on the planned resumption of such experiments. In 1981, Ji Yongxiang, head of a hospital in Shenyang, was reported as claiming to have been part of a 1967 experiment in Shengyang in which a chimpanzee female had been impregnated with human sperm. According to this account, the experiment was cut short by the Cultural Revolution, with the responsible scientists sent off to farm labour and the three-months pregnant chimpanzee dying from neglect. According to Timothy McNulty of Chicago Tribune, the report was based on an article in the Wenhui Bao newspaper of Shanghai. Li Guong of the genetics research bureau at the Chinese Academy of Sciences was cited as confirming both the existence of the experiment prior to the Cultural Revolution and the plans to resume testing. In 2019, unconfirmed reports surfaced that a team of researchers led by Professor Juan Carlos Izpisua Belmonte from the Salk Institute for Biological Studies in the U.S. successfully produced the first human-monkey chimera. Belmonte and others had previously produced pig and sheep embryos containing a small percentage of human cells. As with those embryos, the human-monkey chimeras were reportedly only allowed to develop for a few weeks. Although development was stopped prior to the formation of a nervous system or organs, avoiding more severe ethical concerns, the research was reportedly carried out in China to avoid legal issues. Due to the much larger evolutionary distance between humans and monkeys versus humans and chimpanzees, it is considered unlikely that true human-monkey hybrids could be brought to term. However, it is feasible that human-compatible organs for transplantation could be grown in these chimeras. Evidence for early hominin hybridization There is evidence for a complex speciation process for the Pan–Homo split. Different