I think he was talking about this: http://www.dailymail.co.uk/sciencetech/article-437215/Scientists-use-pig-bladder-help-man-regrow-fingertip.html http://www.d

I think he was talking about this: http://www.dailymail.co.uk/sciencetech/article-437215/Scientists-use-pig-bladder-help-man-regrow-fingertip.html http://www.dailymail.co.uk/sciencetech/article-437215/Scient... If I remember correctly, this isn't widely used because of cancer risks.