He took the title of senior author but really didn't know what was going on with the data.

We could have made tremendous progress in getting these cells toward clinical application if federal funding had been available.

There is still a great deal of excitement in this field.

Clearly the scientific credibility of Korean investigators has been compromised.

We'll have to deal with the cynicism and anything that comes our way politically from the policymakers. But people should realize that anything that is wrong with the science is of no value to us either.

Although it hurts, I think we have to say that if there is fraud of any kind ... it has to be exposed, no matter what the cost. The truth is of more value than anything else.

Should reviewers have caught some of this? Yeah, probably they should have. Obviously great claims require great proof, and maybe more people should review such a paper.

Their data are certainly very good . . . and quite significant, ... is problematic.

I think we have to keep our eye on the ball here. If this stuff proves to work, that's wonderful. But we're just not there yet, and it's going to take a long time to demonstrate that. Meanwhile, other techniques already work well. So let's get on with it.