See post 418.
I would furher point out that it is not the priciple of scientific research that is objected to (by most Christians) but rather incomplete and sloppy research.
It is scientists who took the quick and easy way, jumping to the conclusion that only embryonic cells would do, who raised false hopes of cures.
Time, patience and the responsible use of scientific method later showed that adult and placental cells offered much more promise.
If science had incorporated even the most rudimentary vestiges of natural moral law, much less the Christian perspective, then strides could have been made even faster in cellular research. Using ethical guidlines never prevents progress, it only protects civilization from the profane