What's a Blastocyst, Anyway?
Let’s clarify: Senator Bill Frist doesn’t think we should experiment on all embryonic stem cells. He said we should use for research “Only Blastocysts That Would Otherwise Be Discarded.”
Okay. But what’s a blastocyst?
“Another high quality human blastocyst
The developing fetus itself is the area marked as “ICM” (inner cell mass)”
From the Advanced Fertility Center of Chicago, using blastocyst transfer “with IVF can give high pregnancy rates.”