Scientists largely agree that stem cells hold potential for the treatment, and possible cure, of many serious medical conditions such as Parkinson’s disease, cancer, diabetes and heart disease. While the use of adult stem cells in biomedical research is widely accepted, many religious groups oppose embryonic stem cell research, which involves the use and destruction of human embryos. The Catholic Church and many evangelical Protestant groups have called for a ban on all embryonic stem cell research, believing that “embryos constitute life.”