California and New Jersey announce they will raise state funding to support embryonic stem cell research, including research on stem cell lines created after August 9, 2001.
2005 - Connecticut and Illinois designate state funds to support stem cell research in their states.
February 2005 - South Korean scientist Hwang Woo Suk publishes a study in Science announcing he has successfully created stem cell lines using therapeutic cloning.
December 2005 - Experts from Seoul National University accuse Hwang Woo Suk of having faked some of his research. Hwang Woo Suk asks to have his paper withdrawn while his work is being investigated and resigns his post.
January 10, 2006 - An investigative panel from Seoul National University accuses Hwang Woo-suk of faking his research.
July 18, 2006 - The Senate votes 63-37 to loosen President Bush's limits on federal funding for embryonic stem-cell research.
July 19, 2006 - President Bush vetoes the embryonic stem-cell research bill passed by the Senate (the Stem Cell Research Enhancement Act of 2005), his first veto since taking office.
June 20, 2007 - President Bush vetoes the Stem Cell Research Enhancement Act of 2007, his third veto of his presidency.
January 23, 2009 - The FDA approves a request from Geron Corp. to test embryonic stem cells on eight to 10 patients with severe spinal cord injuries. This will be the world's first test in humans of a therapy derived from human embryonic stem cells. The tests will use stem cells cultured from embryos left over in fertility clinics.
March 9, 2009 - U.S. President Barack Obama signs an executive order overturning an order signed by President George W. Bush in August 2001 that barred the National Institutes of Health from funding research on embryonic stem cells beyond using 60 cell lines that existed at that time. - Obama says, "In recent years, when it comes to stem cell research, rather than furthering discovery, our government has forced what I believe is a false choice between sound science and moral values. In this case, I believe the two are not inconsistent. As a person of faith, I believe we are called to care for each other and work to ease human suffering. I believe we have been given the capacity and will to pursue this research -- and the humanity and conscience to do so responsibly."
August 23, 2010 - U.S. District Judge Royce C. Lamberth issues a preliminary injunction that prohibits the federal funding of embryonic stem cell research.
September 9, 2010 - A three-judge panel of the U.S. Court of Appeals for the D.C. Circuit grants a request from the Justice Department to lift a temporary injunction issued Aug. 23 that blocked federal funding of stem cell research.
September 28, 2010 - The U.S. Court of Appeals for the District of Columbia Circuit lifts an injunction imposed by a federal judge, thereby allowing federally funded embryonic stem-cell research to continue while the Obama administration appeals the judge's original ruling against use of public funds in such research.
October 8, 2010 - The first human is injected with cells from human embryonic stem cells in a clinical trial sponsored by Geron Corp.
November 22, 2010 - William Caldwell, CEO of Advanced Cell Technology, tells CNN that the FDA has granted approval for his company to start a clinical trial using cells grown from human embryonic stem cells. The treatment will be for an inherited degenerative eye disease.
April 29, 2011 - The U.S. Court of Appeals for the District of Columbia lifts an injunction, imposed last year by a federal judge, banning the Obama administration from funding embryonic stem-cell research.
May 11, 2011 - Stem cell therapy in sports medicine is spotlighted after New York Yankee pitcher Bartolo Colon is revealed to have had fat and bone marrow stem cells injected into his injured elbow and shoulder while in the Dominican Republic.
July 27, 2011 - Judge Royce Lamberth dismisses a lawsuit that tried to block funding of stem cell research on human embryos.
February 13, 2012 - Early research published by scientists at Cedars-Sinai Medical Center and Johns Hopkins University show that a patient's own stem cells can be used to regenerate heart tissue and help undo damage caused by a heart attack. It is the first instance of therapeutic regeneration.
April 4, 2012 - According to Michael Waalkes, Ph.D. and his team at the National Toxicology Program and Laboratory, National Institute of Environmental Health Sciences, part of NIH, arsenic can turn normal stem cells into cancer stem cells and develop tumor growth.
May 16, 2013 - Scientists make the first embryonic stem cell from human skin cells by reprogramming human skin cells back to their embryonic state.