A Polymerase Chain Reactor (PCR), a device that allows scientists to copy specific genes thousands of times over, is considered a staple of any molecular biology don at the Jackson Laboratory facilities in Bar Harbor, Maine on July 15, 2010. Greg Kahn/Staff

Photo by GREG KAHN

A Polymerase Chain Reactor (PCR), a device that allows scientists to copy specific genes thousands of times over, is considered a staple of any molecular biology don at the Jackson Laboratory facilities in Bar Harbor, Maine on July 15, 2010. Greg Kahn/Staff

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