"It's called the Genetic Gland."
"It absorbs Zerg Genetic Essence Liquid, breaks it down, and stores the components. It's then placed into a Fusion Zygote, which is the first step of the modification."
"The Fusion Zygote is then implanted in the subject's lower back, where it connects externally to the nerves at the base of the spine. The Fusion Zygote absorbs the host's cellular genes, using them as a template, and eventually divides to produce a batch of assimilated Zerg cells in the surrounding area."
"Of course, the Genetic Gland can also be implanted directly into the subject's body. But that would be just like consuming Zerg flesh—very few people can withstand it. Even a Tier Two Awakener would have a hard time adapting quickly, and there would be significant side effects."
