RT Journal Article SR Electronic T1 Genetic modification of characteristic masculine traits: enhancement or deformity? JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 736 OP 740 DO 10.1136/medethics-2012-100976 VO 39 IS 12 A1 Jeff McMahan YR 2013 UL http://jme.bmj.com/content/39/12/736.abstract AB