I haven't read any comics in about 15 years and I don't think this was ever explored back then. In the comics, Wolverine's healing ability has been so powerful at some points that he has regenerated back from pretty near nothing. Have they ever done a story line where parts of his body separated from him basically grow back as a complete clone? Say, he loses his hand, has that hand ever grown back an entire copy of him? Has there ever been an explanation as to why something like this hasn't happened?