Ethical Analysis: Ethical Impasse For an explanation of the ethical impasse that ANT addresses: ANT summary, by William B. Hurlbut For more detailed background: ANT analysis, by William B. Hurlbut (also published as: Hurlbut, William B. "Altered Nuclear Transfer as a Morally Acceptable Means for the Procurement of Human Embryonic Stem Cells" Perspectives in Biology and Medicine - Volume 48, Number 2, Spring 2005, pp. 211-228, The Johns Hopkins University Press. Copyright 2005 The Johns Hopkins University Press. Used by permission.) Photos courtesy of James Resau and the Van Andel Institute in Grand Rapids, MI.