Shinya Yamanaka of Kyoto University in Japan is the dominant scientist in cellular reprogramming, but he has stiff competition from a well-linked group of US-based researchers. To map influence in the field. New Scientist constructed a social network diagram (left) based on citations, the references to each scientist's work by their peers. Citations are a measure of a researcher's impact and influence, and are sometimes used to help make decisions on promotions. They can also provide a snapshot of who's who in a field.
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