This is a question that is coming up during one of my RPG games.
One of my players is a Heretek Genetor, working in the employ of a Rogue Trader. He recently had his leg torn off by a Flesh Hound, and instead of replacing it with bionics as would be common, wants to try and grow himself a new limb.
I know that such science does exist in 40k. I've heard all sorts of references to vat-grown organisms and such (muscles, servitors, cherubs etc), but I was curious as to just how complex and rare it actually is.
What kind of work and resources would he require to engage in such operations, and are they relatively common procedures for a genetor, or are they only the purview of the most esteemed and learned members of the Magos Biologis?