In 2006/7 Japanese cell biologist Shinya Yamanaka published important
 research showing that specialized adult cells such as skin cells could 
be “reprogrammed” to become pluripotent stem cells.  Yamanaka called the
 reprogrammed cells “induced pluripotent stem cells” (or iPSCs) and the 
type of research “cell reprogramming”.
He neither created nor experimented upon human embryos in his 
research.  But to make reagents for reprogramming the somatic cells, he 
apparently did use cells from a cultured cell line created in 1977 and 
originally derived from the tissue of a child who was aborted earlier in
 the 1970s (called “HEK cells,” Human Embryonic Kidney cells).  If I 
understand the process correctly, the genes used to reprogram the 
somatic cells were delivered into the cells using viruses (called 
lentiviral vectors).  These viral delivery systems were created using 
HEK cells.
Pro-life groups such as Children of God (COG) for Life have drawn 
attention to this little known fact and in doing so have provided the 
pro-life community an important service.  
Unfortunately, some of these groups are claiming that because 
Yamanaka used ‘tainted’ cells in his research, the production of iPSCs 
by cell reprogramming is intrinsically evil. 
They are incorrect.  The production of iPSCs does not require the use
 of HEK cells, and can be—and is being—done successfully without them.  
If the research is carried out without using ‘tainted’ cells, then the 
procedure itself need pose no moral problems.  
They also argue that because Yamanaka used tainted cells, his 
research, for which he received the 2012 Nobel Prize, deserves a blanket
 condemnation.  For two reasons, I disagree.  
First, a blanket condemnation fails to make distinctions between what
 is praiseworthy and what might deserve criticism.  With respect to the 
latter, if Yamanaka knew the immoral origin of the HEK cells, had 
reasonable alternatives available to him, and yet still used the tainted
 cells, then (to that extent) I think he did wrong.  
His wrongdoing certainly would not be the wrong of killing; 
nor would it be wrongful cooperation in killing, since using cells from 
the cultured line 30 years later did not facilitate the original 
evildoing in any way.  Moreover, using HEK cells in research is unlikely
 to cause scandal in the formal sense (i.e., be a cause of leading 
others into grave sin), since HEK is so widely used in the scientific 
community that it barely raises an eyebrow.  
Its wrongness would lie in the failure of the duty we all share to testify to the value of human life, in this case by refusing
 to use products created by exploiting life: a failure of duty to bear 
witness to the truth.  To constitute a moral failure, however, Yamanaka 
would have had to know the origins of the cells, have reasonable 
alternatives available, and not select them.  I don’t know if these 
conditions prevailed.
Because of Jesus’ perspicuous self-sacrificing witness to truth, 
Christians, called to be Christ in the world, have an especially strong 
duty to bear witness.  I don’t know if Yamanaka is a Christian.  If he 
is, then he shares that stronger duty.  If not, he still has a duty to 
the truth.  But we know that even Christians, including Christian 
leaders, sometimes fail to bear rightful witness.  Blanket condemnations
 of their lives or apostolates would be simplistic and could be 
wrongful.  Why?  Because one’s life is a complex matrix of actions, some
 of which may, and others of which may not, bear perspicuous witness.
If in one respect his research fails to measure up to ethical 
standards, in another, the Japanese researcher has been an extraordinary
 witness to the truth of the sanctity of human life.  As one of the 
leading adult stem cell researchers in the world, he dedicated years of 
his life to finding a way of deriving pluripotent stem cells without 
killing embryos.  His research has transformed a field, which once was 
almost monolithically committed to embryo destructive research.  At a 
time when Obama was about occupy the Oval Office and running on a 
platform of overturning the Bush stem cell policy, just twelve months 
earlier (Nov. 2007) Yamanaka published this almost incredible news: “a 
new way to make pluripotent—embryonic like—stem cells without exploiting
 embryos.”  I don’t think there’s any doubt that because of his 
accomplishments, many, many less embryonic people are being killed today
 in research than otherwise would be.  And this was precisely part of 
Yamanaka’s motives, to stop embryo destructive research.  Whatever in 
his research deserves criticism, this deserves praise.  
Second, modern secular science is a morally mixed bag.  The wheat and
 weeds are mixed together in a giant field we call the scientific 
endeavor.  One of the points of genius of the empirical method is its 
limitless and unfolding capacity for generating new and deeper knowledge
 by building on the systematic accomplishments of earlier research.  If 
earlier research, however, entails immoral activity, the products and 
knowledge gained by it will in some way be tainted by the immorality.  
In the field of stem cell research, including morally licit adult 
stem cell research, no one can claim that the knowledge they rely upon 
or the products they use are “pure” and unrelated to prior research that
 has been illicitly obtained.
So how should we assess scientific accomplishments, such as those of 
Yamanaka, that include morally questionable elements?  We condemn gross 
immorality when we find it; and so we condemn the original killing of 
the baby in the 1970s, which Yamanaka had nothing to do with.  We 
criticize the scientific exploitation of the baby’s mortal remains.  We 
deplore the indifference of some scientists to the original killing.  
And we admonish researchers in the present to bear witness to the truth 
by refusing to use products derived from the baby’s tissues.  
If they use them out of non-culpable ignorance, then they do no more 
wrong than did children who innocently drank Pepsi products that 
utilized flavor chemicals developed in research using HEK cells.  
If they use them with full knowledge, but don’t have reasonable 
alternatives, then we assess two things: 1) whether the use is likely to
 cause scandal, and 2) if the research is serious enough to warrant 
tolerating (but not intending) other harms that might arise from the use
 (e.g., legitimizing in people’s minds the original illicit act).  If 
there is proportionately grave reason and if using the products is unlikely to cause scandal, then we may conclude the researchers are justified in using them.  
If reasonable alternatives are readily available, and informed 
researchers don’t use them, then we are warranted in concluding that 
they fail in their duty to witness to the truth by refusing to use the 
alternatives. 
But we also praise the good they do, in Yamanaka’s case, in effectively—and by intent— dealing a lethal blow to one of the most immoral forms of scientific research in modern history.
 
