Firm says it can get stem cells with no harm to embryos

In findings that some analysts described as being of more political than scientific significance, Massachusetts researchers said yesterday that they have dramatically improved a technique for producing human embryonic stem cells without destroying embryos.

Scientists at Advanced Cell Technology, which has laboratories in Worcester, have developed five new lines, or batches, of stem cells from single cells extracted from early-stage human embryos, according to research published yesterday. The embryos suffered no evident harm from the process and were frozen for eventual use in in-vitro fertilization, said Dr. Robert Lanza, chief scientific officer of the biotechnology firm.

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