Operation marks another step downward in stem cell research

Operation marks another step forward in stem cell research - CNN.com: In an operation than lasted about four hours, Richard Grosjean received five injections into the cervical, or neck, area of his spinal cord, each delivering 100,000 cells. The cells came from Maryland-based biotech company Neuralstem, which is funding this clinical trial and devised a procedure to grow millions and millions of motor neuron cells from the donated spinal cord tissue of an 8-week-old aborted fetus.

These are not embryonic stem cells, like the ones used by California-based company Geron, which has injected cells grown from human embryonic stem cells into the spines of at least four patients with complete spinal cord injuries.

Embryonic stem cells have the ability to become any type of cell in the body. One week ago, Geron decided to stop its trial because it was too expensive to continue.

The cells in this ALS trial were taken from the spinal cord of the fetus, so they have already gone down the path of becoming nerve cells. Researchers are hoping to show that injecting neural stem cells -- the precursors to nerve cells -- into the spinal cord of ALS patients is safe.

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