Women participate in a breast cancer fund-raising in Denver in 2011. Despite decades of awareness campaigns, the survival rate for women with metastatic breast cancer hasn't improved.
Helen H. Richardson/Denver Post/AP
Isabella Beukes, of Santa Rosa, Calif., has been legally blind for more than 40 years. An experimental treatment derived from embryonic stem cells seems to have enabled her now to see not just color but also some shapes.
Tim Hussin for NPR
Insulin is produced by the green cells that are in clusters about the same size as the islets in the human pancreas. The red cells are producing another metabolic hormone, glucagon, that prevents low blood sugar.
Houston Texans Coach Bill O'Brien (center) Chief Operating Officer Cal McNair (right) and Houston Chronicle reporter Brian Smith take the ALS Ice Bucket Challenge Thursday to raise money for the ALS Association.
David J. Phillip/AP
Clear and clean, bubble wrap is well-suited to serve as an array of tiny test tubes. Here a dye solution is injected into the bubbles to measure the hemoglobin concentration in blood.
American Chemical Society
The heart beats in a mouse embryo grown with stem cells made from blood. Now the research that claimed a simple acid solution could be used to create those cells has been retracted.
Courtesy of Haruko Obokata