AP Photo 1 month ago

Human corneal tissue derived from ISCO's human parthenogenetic stem cells. Cultured at ISCO's wholly owned subsidiary, Lifeline Cell Technology, Walkersville Maryland.

Tiny, a mouse created from powerful stem cells created from mouse skin, looks around on a sofa in China in this January 2009 photograph made available July 24, 2009.

Tiny, a mouse created from powerful stem cells created from mouse skin, looks around on a sofa in China in this January 2009 photograph made available July 24, 2009.

Tiny, a mouse created from powerful stem cells created from mouse skin, looks around on a sofa in China in this January 2009 photograph made available July 24, 2009.

Hwang Woo-suk, South Korea's disgraced stem cell scientist, leaves after his trial on charges of fabricating data for his research papers, at the Seoul Central District Court June 8, 2009.

Hwang Woo-suk, South Korea's disgraced stem cell scientist, leaves after his trial on charges of fabricating data for his research papers, at the Seoul Central District Court June 8, 2009.

AP Photo 6 months ago

Scientist Julie Mandel explains the process of separating stem cells in preparation for StemEx(R) production to Israeli President Shimon Peres during his visit to Gemida Cell in Jerusalem on May 19, 2009.

AP Photo 6 months ago

Scientist Julie Mandel explains the process of separating stem cells in preparation for StemEx(R) production to Israeli President Shimon Peres during his visit to Gamida Cell in Jerusalem on May 19, 2009.

Post-doctoral fellow Huajung Choi differentiates the stem cells of mice at the Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research at the University of California San Francisco in San Francisco March 10, 2009.

Vials of extra-embryonic stem cells are pictured at the Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research at the University of California San Francisco in San Francisco March 10, 2009.

Miko Kapidzic, a specialist for extra-embryonic stem cells, works at the Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research at the University of California San Francisco in San Francisco March 10, 2009.

Post-doctoral fellow Huajung Choi differentiates the stem cells of mice at the Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research at the University of California San Francisco in San Francisco March 10, 2009.

Getty Images 8 months ago

MADISON, WI - MARCH 10: A colony of human embryonic stem cells is seen on a computer monitor the is hooked up to a microscope at the Wisconsin National Primate Research Center at University Wisconsin-Madison March 10, 2009 in Madison, Wisconsin.

AP Photo 8 months ago

Dr. Stephen Rennard, who oversees stem cell research at the University of Nebraska Medical Center, leads journalists to his lab, in Omaha, Neb. , Monday, March 9, 2009.

AP Photo 8 months ago

Stem cell researcher Tadashi Sato holds a dish containing stem cell growth medium, at the University of Nebraska Medical Center, in Omaha, Neb. , Monday, March 9, 2009.

AP Photo 8 months ago

President Barack Obama signs an Executive Order on stem cells and a Presidential Memorandum on scientific integrity, Monday, March 9, 2009, in the East Room of the White House in Washington.

AP Photo 8 months ago

President Barack Obama signs an Executive Order on stem cells and a Presidential Memorandum on scientific integrity, Monday, March 9, 2009, in the East Room of the White House in Washington.

AP Photo 8 months ago

Chart shows stem cell process.

AP Photo 8 months ago

President Barack Obama signs an Executive Order on stem cells and a Presidential Memorandum on scientific integrity, Monday, March 9, 2009, in the East Room of the White House in Washington.

A fluorescent microscope image shows human embryonic stem cells in this photo taken at Stanford University and released by the California Institute for Regenerative Medicine, March 9, 2009.

A microsopic view shows human embryonic stem cells in various stages of differentiation into liver cells in this photo taken at Stanford University and released by the California Institute for Regenerative Medicine, March 9, 2009.

U.S. President Barack Obama signs an Executive Order on stem cell research while in the East Room of the White House in Washington March 9, 2009.

A human embryonic stem cell line derived at Stanford University is seen in this handout photo released to Reuters by the California Institute for Regenerative Medicine, March 9, 2009. The line was derived under controlled conditions that could make the cells useful for transplantation.

A microscopic view shows a colony of human embryonic stem cells (light blue) growing on fibroblasts (dark blue) in this handout photo released to Reuters by the California Institute for Regenerative Medicine, March 9, 2009.

AP Photo 8 months ago

President Barack Obama signs an Executive Order on stem cells and a Presidential Memorandum on scientific integrity, Monday, March 9, 2009, in the East Room of the White House in Washington.