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In his day job, UC Davis scientist Paul Knoepfler probes the inner workings of stem cells and cancer cells and what makes them behave the way they do.

On the side, the father of three daughters blogs about costly, unproven stem cell treatments and provides guidance for those seeking experimental therapies.

Knoepfler is a rare stem cell researcher who regularly explores the most problematic aspects of stem cell therapies on the Internet in full public gaze. He considers himself an advocate for patients as well as a scientist, having survived an aggressive form of prostate cancer at the age of 42.

Now 46, Knoepfler began his blog in 2010, shortly after his cancer was diagnosed. His blogging has encountered resistance from some colleagues, who are uncomfortable with such public endeavors. But he has polished and expanded the blog to the point that it has received international recognition. He will receive an award in December at the World Stem Cell Summit in San Diego for his advocacy efforts.

This month he moved beyond cyberspace and published “Stem Cells: An Insider’s Guide”...