The original Shin was one of Orochimaru’s Old experimental test subjects and Orochimaru’s loyal follower. Shin possessed a unique genetic makeup that allowed for tissue and organ transplantation with absolutely no chance of rejection. Orochimaru’s performed several experiments in the past and cultivating clones from Shin’s nerves and teeth in order to uncover the secrets of genetics. It is from these experiments that Shin clones originated. The majority of Shin surviving clones follow the original shin, treating Shin as their father and take all orders he give,
but a one clone remains in Orochimaru’s hidden laboratory. Unknown to the original Shin, the clones had proceeded to create their own clones.