Some people believe that the creation of chimeras involving human cells for medical research is morally acceptable as long as the chimera has no level of human conciousness. Therefore research in which it is possible for human stem cells to produce part of an animal's brain should be conducted with great care. The National Academies guidelines prohibit the introduction of human cells into the blastocyst of a non-human primate, or the introduction of any animal and human cells into a human blastocyst. The guidelines also prohibit the breeding of human animal chimeras in the unlikely event that any human genetic material would be contained in their reproductive cells.
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