If a ninja is born with a kekki genkai that isn't a dojutsu, how does that ninja know? How does that ninja acquire it? Im pretty sure that those that are born within their clan with one isn't know to have one right off thr back. I mean if the opposite were true, wouldn't Hashirama have been a main target? Back when Hashi was explaining his flashback, he showed no signs of mokuton. Im guessing neither he nor anyone else knew he had it. My question is how does a shinobi know that he/she is blessed with a kekki genkai?