But it is not yet known whether tissues derived from embryonic stem cells would cause transplant rejection, whereas this does not seem to be a problem with adult stem cells.

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Geron and GE Healthcare, a division of General Electric, are developing and commercializing cellular assay products derived from human embryonic stem cells for use in drug discovery, development and toxicity screening.

FORBES

And Geron of Menlo Park, Calif. is performing animal studies on a variety of different cells derived from human embryonic stem cells, aiming to treat spinal cord injury, heart disease and diabetes.

FORBES: Magazine Article

General Electric ( GE - news - people ), are developing and commercializing cellular assay products derived from human embryonic stem cells for use in drug discovery, development and toxicity screening.

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And Geron (nasdaq: GERN - news - people ) of Menlo Park, Calif. is performing animal studies on a variety of different cells derived from human embryonic stem cells, aiming to treat spinal cord injury, heart disease and diabetes.

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Stem cells derived from umbilical cords are less versatile than embryonic stem cells, which could conceivably replace any cell in the body.

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Opponents of embryonic stem cell research, which involves destroying the donated embryos from which cell lines are derived, have long argued that the discovery of iPS cells in 2006 (for which Shinya Yamanaka was awarded the Nobel Prize in Medicine this past year) obviates the need for embryonic stem cell research.

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