Kekkei genkai (血継限界; Literally meaning "a technique limited to inheritance by blood" or "Bloodline Limit") are abilities passed down genetically in specific clans. It's possible for a ninja to have more than one of these abilities. Kekkei genkai abilities that work via the user's eye are called dojutsu. Other Kekkei Genkai include mixing one type of elemental chakra with another, creating a new one unique to the users, which is usually impossible for normal ninja. Some ninja with such powers are Sasuke Uchichiha and Haku. A somewhat related ability is the ability to change eye color and along it the persons strengths and abilities.