Kaguya Clan

The Kaguya clan (かぐや一族, Kaguya Ichizoku) was a (now extinct) clan, known to have been very barbaric. Select few, namely Kimmimaro, possessed the Kekkai Genkai Shikotsumyaku. The clan was very savage and had no tactics when going to battle, and refused to back down even when surrounded and completely outmatched, preferring to fight to the death for fun. Kimimaro would for years live as the last member of the Kaguya clan, but eventually died of a terminal disease.
 * Known members: Kimmimaro, Genkimaro.

Apparently, the members who possess the Shikotsumyaku abilities have a different bodily structure, as when Kimimaro was fatally ill, Kabuto Yakushi, claimed there had been too little information on his body to give any medical treatment.