Labs that derive new human embryonic stem cell lines are few, partly because they can not get financial support from federal sources. (uofmhealth.org)
129 mice are widely used in the production of targeted mutations due to the availability of multiple embryonic stem cell lines derived from them. (jax.org)
He ruled that work on existing embryonic stem cell lines derived outside federally funded labs did not violate a ban on the destruction of embryos. (scientificamerican.com)