User blog comment:Cryptomania/Bile Ideas/@comment-4608429-20120617123834/@comment-2253300-20120617182140

No, but Space Marines are marvels of genetic engineering that have not been replicated by anybody since. Using Gene-seed to make new Marines isn't too hard, but fabricating new Gene-seed from scratch is nearly impossible. That is why Space Marine Gene-seed is probably the single most valuable resource in the Imperium.