 The United States Catechism for Adults devotes a section to in vitro fertilization , stem @-@ cell research and <unk> in its explanation of the fifth commandment , because these often involve the destruction of human embryos , considered to be a <unk> sinful form of murder . <unk> stem cell research is called " an immoral means to a good end " and " morally unacceptable . " Citing the Congregation for the Doctrine of the Faith 's <unk> on Respect for Human Life in its Origin and on the <unk> of <unk> , the US Bishops quote : " No objective , even though noble in itself , such as a foreseeable advantage to science , to other human beings , or to society , can in any way justify experimentation on living human embryos or <unk> , whether viable or not , either inside or outside the mother 's body . " The Bishops note that adult stem cell research , using cells obtained with informed consent , is a promising field of research that is morally acceptable . 
