Board Thread:Warhammer 40k General Discussion/@comment-24332685-20140106171610/@comment-217.234.125.242-20150104121343

he 700 sth variances are dated at the year of the isstvaan atrocity ( source is "deliverance lost")

nowadays there are more, as the gene seed went through 10k years of  use, also you have things like the 21st founding, where the magos biologis went about "enhancing" the gene-seed

it is only rumoured that empi was the source of their dna and not the primarchs but we have no data on that