Perhaps the kookiest thing I have come across in days is a report concerning "an influential group of bioethicists" gathered together by Johns Hopkins who have approved the use of human brain cells in the developing brain matter of chimps and great apes.
The bioethicists caution that in a search to find a treatment or cure of diseases of the brain, there should be no implanting of large numbers of humann cells in the developing brains of these animals. Currently no country is doing this, of course, but leave it to the "brainy bioethicists" to come up with such intellectual mischief totally divorced from ethical standards.
See "Panel lays out rules for using stem cells in primate brains."