"The human embryonic kidney (HEK) 293 cell line, derived from an elective abortion in the 1970s, is routinely used for production of proteins and cultivation of viruses due to the ease of transfection with gene constructs that are efficiently translated into appropriately folded proteins (Wong 2006). A PubMed search with the term “HEK,” lists more than thirty thousand citations, testifying to the extensive use of this cell line.1 The Catholic Church’s position on the use of HEK293 cells, or other cell lines generated from elective abortions, in medical research is that they should be avoided because other-wise this creates a “contradiction in the attitude of the [researcher] who says that he does not approve of the injustice perpetrated by others, but at the same time accepts for his own work the ‘biological material’ which the others have obtained by means of that injustice” (Congregation for the Doctrine of the Faith 2008, no. 35). Again, alternatives should be explored. Utilization of fetal tissue from spontaneous abortion (miscarriage) is licit. In addition, COS-1 cells that are not derived from elective abortions are effective for production of proteins that could be utilized in some studies (Smith 2009). Unfortunately, COS-1 cells are of monkey origin. Hence, xenogeneic differences between monkey and human proteins limit their use in the generation of vaccines."