Roundup: Guilt-free stem cells, the trials of Avandia, sponsor research bias, news from ASCO, and more

Flip switch for stem cells — Three research teams reported a technique for “reprogramming” skin cells into embryonic stem cells, those primordial bits of protoplasm that can propagate themselves indefinitely and, under the right conditions, transform themselves into any type of cell in the body. Deriving embryonic stem cells normally requires destroying an embryo — the main reason research with the cells remains limited, as does federal support for the work.