Board Thread:General Discussion/@comment-89.142.252.18-20150801103140/@comment-25396609-20150801230242

(the following is likely total bullshit)

If I recall correctly, every species of animal has a sort of master sequence in their genetic code that determines how the resDNA is interpreted by whichever biological system builds and repairs body parts, so even if you did splice, say,  the genes that let a cuttlefish change colors into a humans code, it wouldn't let them change colors.