In a new paper published in BMC Evolutionary Biology, researchers found that changes in a receptor protein, called the aryl hydrocarbon receptor 2 (AHR2), may explain how killifish in New Bedford Harbor evolved genetic resistance to PCBs. (Courtesy of Evan D’Alessandro, Rosenstiel School of Marine and Atmospheric Science)

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In a new paper published in BMC Evolutionary Biology, researchers found that changes in a receptor protein, called the aryl hydrocarbon receptor 2 (AHR2), may explain how killifish in New Bedford Harbor evolved genetic resistance to PCBs. (Courtesy of Evan D'Alessandro, Rosenstiel School of Marine and Atmospheric Science)