User blog comment:Uondarando/Season 2?/@comment-71.179.118.168-20120723024602/@comment-166.250.32.86-20120804091059

Ganta was not experimented on. He was a normal child. Before commenting on a series that has done a pretty good job of following the manga, READ the manga.... the only thing the "tattoo" is suppose to show is what the crystal is doing to Ganta that Shiro/Red Man implanted in him in order to get him to come to the island in the first place. The crystal is effecting his body to where his abilities will change with the continuing mutation of the crystal.