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A '''Genestealer Hybrid''' is a mixture of any being infested by a [[Genestealer]] and another race. Hybrids are or the progeny of humans (or other races) infected by Genestealer genetic materialsuch an individual.{{Cite this}}

Purestrain Genestealers can only reproduce by infecting a victim with their genetic material. The gene-host survives as a healthy human being, but, upon becoming a parent, the gene-host's its firstborn child is indelibly marked by the gene-infection. Once the child matures into a human-genestealer hybrid, it can pass the infection on to other humansothers, whose firstborn firstborns will , in turn, also be born as hybrids. It is only the firstborn child of infected parents that is a Human-Genestealer Hybrid; later offspring will always be normal humansmembers of the parent species.{{Cite this}}

The first generation Hybrids closely resemble Purestrain Genestealers. But, with each new generation of Hybrids, Genestealer traits give way to Human host species traits, until fourth generation Hybrids are all but indistinguishable from those untainted humans. However, a Hybrid will always display the Genestealer's primal instincts; these always remain in their genetic structure, and - no matter how human normal in appearance - a hybrid belongs to the Genestealer brood.{{Cite this}}

Purestrain Genestealers are totally incapable of passing as humananything innocuous. Their multiple arms, bulbous heads, glaring eyes, and animal crouch give them away; no amount of clothing and make-up can disguise such characteristics. However, later generations, particularly the third and fourth, become more humanoid typical in appearance. Indeed, many genestealers of advanced generations can appear as humans standard host species at first glance, especially if wearing concealing clothing. However, as their sharp teeth and hypnotic eyes are somewhat of a giveaway, they tend to avoid speaking to strangers or looking at people straight in the face.{{Cite this}}

It follows that, in many ways, the later generation hybrids are the most dangerous - they can move freely among humansothers, passing on their terrible disease unnoticed.{{Cite this}} Due to the sheer number of humans throughout the galaxy, they are the race most commonly affected by genestealers. Nevertheless, there is no reason why any other race cannot be infected; [[Ork|ork]]-genestealer hybrids are perfectly possible - indeed, many exist. The appearance of such hybrids would, of course, depend on the parent race, and they would show different physical characteristics than a human-genestealer crossbreed.{{Cite this}}

Although most documented cases of Genestealer Hybrids have been of human hosts, Genestealers can infect a range of different species. The taint created by Genestealers is known to be able to be sown amongst almost every race with the likes of the [[Tau]], [[Eldar]], [[Kroot]], [[Hrud]] and [[Ork]]s being species that can spawn hybrids with the contagii being an adaptable breed.{{Fn|6}}{{Fn|9}}