This could help:
WASHINGTON (Reuters) - Researchers at a U.S. company trying to push the margins of stem cell research said on Friday they had grown human embryonic stem cells using a non-controversial method that did not harm the embryos.
They said they had grown several lines, or batches, of the cells using a single cell taken from an embryo, which they then froze unharmed.
"We generated three new lines," Dr. Robert Lanza of Advanced Cell Technology Inc. told Reuters.
"These are first human embryonic cell lines in existence that didn't result from the destruction of an embryo."