Board Thread:Naruto Gaiden/@comment-27829630-20151230183737/@comment-25093611-20151230184921

he only needs the DNA that creates the specific part in his brain which causes the special-chakra-production by immense negative emotions :) and since he is a clone i think orochimaru did this for him ^_^

or he has some kind of ability to adapt to body-parts on dna-lvl, this would explain why all his clones got sharingans too after he got his own implanted :D