Board Thread:Theories and Speculation/@comment-25025726-20161107172956/@comment-734582-20161107184132

Sanbi221 wrote: That's true I forgot about that. What about Kekkai Genkai? You need to be part of that clan in order to use the clan jutsu unless it's centered in an organ like the Sharingan. So wouldn't the ability to use that come from the persons DNA which means they would get their chakra too? Yes. Blood does contain your DNA, which is why it works for summoning. But blood cells are continuously refreshed, so after a while a blood transfusion will completely fade.

Which is why actual flesh is a much safer option