Philip Hunter | Dec 14, 2003 | 7 min read
Courtesy of Nadya Lumelsky and Ron McKay PANCREATIC CELL PUZZLE: A cell sub-population in differentiated embryonic stem cell cultures produces pancreatic islet hormones, insulin (red) and glucagon (green). Although most cells produce only one type of hormone, the cells shown in yellow produce both. The co-production of the two hormones might signify developmental immaturity. The ethical dimension of embryonic stem cell research looms so large in the public consciousness that the underly