Thank you for publishing Thomas A. Shannon’s clear and concise article (2/18) about the complex moral and ethical issues surrounding attempts at human cloning to obtain stem cells for therapeutic use, and the related question of induced parthenogenic cell division of human eggs for the same purpose. This article documents the need for care and caution by the scientific community in continuing such research and, importantly, emphasizes the very preliminary stage of our knowledge in the use of stem cells. Implied also is a cautionary note for the magisterium in its authoritative pronouncements about the beginning of human life, when it fails to consider at all the advances in the science of embryology over the last several decades. I hope we can all benefit from the expertise of Professor Shannon and his colleagues.
Robert M. Rowden