But the company says it has obtained stem cells from monkey parthenotes.

Parthenogenesis might be a less disputed way of obtaining stem cells.

The resulting embryo would be destroyed at an early stage to obtain stem cells.

Historically, cells obtained from animals, typically mice, have been used to model cancer related pathways.

The same procedures can be used on cells obtained from bronchoalveolar lavage.

Certain methods of obtaining embryonic stem cells could destroy a potential life in the process, and that is unacceptable.

In the process of obtaining embryonic stem cells, they say, scientists destroy the embryos, thus killing human life.

They had also obtained stem cells from embryos created at fertility clinics and donated by couples who no longer needed them.

Hall writes, "To obtain human embryonic stem cells by currently available technology, you must destroy an embryo."

Advanced Cell has said it plans to clone patients' cells to make embryos from which to obtain stem cells.