"Dr. Stephen Minger, leading stem cell expert at Kings College, told the BBC, "Having been raised a Catholic I found this stance really outrageous."
"Are they going to excommunicate IVF doctors, nurses and embryologists who routinely put millions of embryos down the sink every year throughout the world?" he asked."
They SHOULD excommunicate for IVF as well. More embryos are destroyed through IVF than through embryonic stem cell research.
As multiple posters have pointed out, by their actions they have already excommunicated themselves. That the church hasn't yet acknowledged it publically matters little.