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Study may help explain sunlight's role in melanoma development

A strong link exists between lifetime exposure to ultraviolet light, particularly lifetime sunburns, and the development of melanoma ? the most lethal form of skin cancer. Now, for the first time, scientists have identified a specific molecular pathway within cells that becomes mutated by ultraviolet light exposure, thereby speeding up melanoma development.

Researchers turn rat stem cells into mouse marrow cells

Researchers in North Carolina have successfully demonstrated that genetically altered stem cells from one species can be turned into a different sort of cell in another. Specifically, the researchers converted adult liver stem cells cloned from a male rat into functional adult bone marrow cells in female mice. The accomplishment, known as hematopoietic transdifferentiation, may prove useful for tapping the potential for tissue repair using human adult stem cells.