The result is the culmination of a two-year research project called the Autonomous High Altitude Refuelling (AHR) programme.
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The shortened version of AHR does not bind nearly so easily to PCBs.
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PCBs do their damage by binding to a protein called the aryl hydrocarbon receptor, or AHR, thus stopping it working properly.
Now an international team led by the Royal Belgian Institute of Natural Sciences believes Archaeopteryx (ahr-kee-AHP'-teh-rihx) should indeed be considered a bird.
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The creature called Archaeopteryx (ahr-kee-AHP'-teh-rihx) was widely considered the earliest known bird.
Both Hudson tomcod and New Bedford killifish, however, have unusual AHR molecules.
Dr Hahn has, however, found nine places along the amino-acid chain of killifish AHR where the link in the chain varies between individuals.
In tomcods, AHR is composed of 1, 104 such units.
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