Parahumans
A parahuman or para-human is a human-animal hybrid. Scientists have done extensive research into the combination of genes from different species, e.g. adding human (and other animal) genes to bacteria and farm animals to mass-produce insulin and spider silk proteins. Note that individual genes can be transplanted between species without the transplantation of whole cells.

# Human-animal hybrids
Parahumans are also referred to as "human-animal hybrids". The term parahuman is not used in scientific publications. The term is sometimes used to sensationalize research that involves mixing biological materials from humans and other species. It was used in a National Geographic article to describe an experiment in 2003, during which Chinese scientists at the Shanghai Second Medical University successfully fused human cells with rabbit eggs.

# Rationale
There are several possible reasons that parahumans or chimeras might be created. The current forms of chimera exist for medical and industrial purposes, e.g., production of drugs and of organs suitable for organ transplantation. Other experiments aim to reveal knowledge about the function of the human body, e.g., by creating mice with a human-like immune system to study AIDS or with a brain incorporating human nerve cells. Restrictions on cloning and stem cell research makes chimera research a more attractive alternative in some researchers' eyes.
If parahumans are created using germline engineering, they breed true, and are different enough from ordinary humans to be unable to breed with them, this would qualify them as being a distinct species. Parahumans created using only somatic genetic engineering would have "normal" children. Another key difference is that a germ-line parahuman would most likely be modified before birth, while a somatic parahuman could be an adult human who chooses to be modified. The latter is sometimes seen as more ethical because the changes are made with informed consent; a counterargument is that no harm is done to a person born with modified genes because the person had no control over their genetics in the first place.

# Human-animal hybrids for scientific research
January, 2004
Scientists in Britain have been granted permission to create human-animal hybrid embryos by injecting human DNA into cows' eggs for stem cell research. Researchers from Newcastle University and King's College London submitted the application to the Human Fertilization and Embryology Authority (HFEA), an independent regulatory body that oversees embryo research and fertility treatment in Britain. The scientists said the hybrid human-bovine embryos could prove useful in pursuing treatments to prevent Parkinson's disease and Alzheimer's, as well as spinal cord injuries, diabetes and arthritis. However we have come to believe from recent scientfic research, that combining a human egg from a female donor and sperm from a cow; it is possible to create a cow-human hybrid. Instead of using human eggs, the researchers will remove the nuclei from cows' eggs and replace them with cells from the patients to create cloned stem cell lines that contain the same genetic mutation that results in these neurological disorders. This is groundbreaking research that will result in animal-human offspring later in the year 0f 2010.
"We feel that the development of disease-specific human embryonic stem cell lines from individuals suffering from genetic forms of neurodegenerative disorders will stimulate both basic research and the development of new treatments for devastating brain diseases," Dr. Stephen Minger, of the stem cell biology laboratory at King's College London, said in a release.
Minger cited the short supply of human eggs left over from in vitro fertilization, which have been used for stem cell research but have to be acquired through surgery on the women. "The hybrid embryo would be 99.9 percent human. The only bovine element would be found in DNA outside the nucleus of the cell."
The proposal has appalled critics of stem cell research, who criticize the idea of creating so-called "chimera" (see: Chimera (genetics)) embryos as an unethical and potentially dangerous practice.

# Ethics
There is no scientific field of parahuman research. Ethical, moral, and legal issues of parahuman research are speculative extensions of existing issues that arise in actual research. Some individuals see the creation of chimeras to devalue the uniqueness of human life or to be tampering with a divine plan.
In contrast, some transhumanists see this technology as one of many ways to overcome fundamental human limitations, such as disease and aging, and point out the many potential commercial and medical benefits. The debate can also be seen in terms of individual freedom to use germinal choice technology or reprogenetics.
Other ethical issues (shared with genetic engineering in general) involve the legal and moral status of a hybrid individual or race, whether the decision-making power over its creation should lie with governments or individuals, whether a distinction should be drawn between strictly medical treatments (restoring lost function) and those enhancing humans above some "normal" standard, whether medical ethics allow doctors to offer parahuman-related treatments, and whether xenotransplantation poses risks of cross-species disease transfer.
The developmental biologist Stuart Newman applied for a patent on a human-nonhuman chimera in 1997 as a challenge to the U.S. Patent and Trademark Office and the U.S. Congress on the patentability of organisms.

# Parahumans in fiction
Science fiction authors sometimes use the term parahuman to refer to distinct "races" of human-like creatures created through genetic engineering. A parahuman created starting from a nonhuman-animal template could be considered a biological uplift, as in the works of David Brin, while a parahuman based more closely on the human form and genome might also be called posthuman or transhuman. The role-playing game Transhuman Space and the related book "GURPS Bio-Tech" use the term parahuman interchangeably with variant human to refer to a wide array of heavily modified racial templates. These range from a "Gilgamesh-Series" resembling normal humans but with increased lifespan; a "Lepus-Series" resembling anthropomorphic rabbits; to a "Tek Rat" described as a mix of human, raccoon, and possum. The television series Dark Angel (TV series)|Dark Angel featured a group of parahumans (referred to in the series as "transgenics") with animal DNA selected to enhance their abilities to serve as supersoldiers.  In Chapterhouse: Dune, by Frank Herbert, there is a species called Futar; they are a genetically engineered human/feline hybrid trained to kill the Honored Matres.
Parahumans are a useful concept for the science fiction writer, because they offer ways to explore issues such as racism, alienation, religion, and freedom and to justify colonization of exotic environments such as the ocean or planets with non-Earthlike properties.
One famous work involving parahumans (though not referred to as such) is The Island of Doctor Moreau]] by  has explored the subject of parahumans in a number of science fiction stories, including The Dry Salvages (novella)|The Dry Salvages, "Riding the White Bull", and "Faces in Revolving Souls". John Crowley, in his novel Beasts (John Crowley)|Beasts, centered his plot around lion-human hybrids, with a lone fox-human hybrid acting as a kingmaker.
Humor authors such as Lewis Carroll in English language|English and Sukumar Ray in Bangla have had parahuman characters in their writings. More recently, Teenage Mutant Ninja Turtles, Maximum Ride and Full Metal Alchemist are themed around human-animal hybrids.