Our genome is a machine, from the nucleotides to the packing, to the enzyme activity, to the metabolic flux.
Our bodies are bigger machines made of lots of little machines.
Our minds or conscious egos or "souls" are the neurotransmitter and activation activity of the connectome and all of its cells and synaptic weights and metabolic activity. They're our lived experiences for as long as our brains can function. Minds experience and produce wonderful things.
If you divorce the body from the mind, there is no "person". Just a very complicated machine. A very valuable machine full of parts.
A human body in a vegetative state is not a person. It's a dormant machine. People may have emotional attachment to that vestige, but it is no longer capable of being a person. It is not a person.
We use brain dead humans for organ transplant all the time. If you understand the premise, then it isn't that far-fetched that we might grow vegetative humans in a lab for medical use and research.
Bodies that never have brains can never become persons. They're no different from plants.