Stem cells can develop into many cell types and may help treat diseases. Therapeutic cloning uses stem cells from cloned embryos to generate patient-matched cells for transplantation without immunorejection. While this research offers medical benefits, it also raises ethical concerns and some argue it undermines human dignity. Views on funding and regulating this research differ, as seen in debates around related bills in the U.S. Congress and state legislatures. Public opinion polls show most support therapeutic cloning if it is not tied to embryo destruction.