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About the Cover
Cover: Some insects rhythmically compress large segments of their tracheal systems. The image on the right is a composited, high-resolution x-ray radiograph of the carabid beetle Pterostichus stygicus, a species that displays this behavior. Socha and colleagues (pp. 3409−3420) used synchrotron x-ray phase contrast imaging to visualize internal tracheal dynamics in living P. stygicus beetles. Concurrent respiratory recordings show that one function of rhythmic tracheal compression is to convectively expel air from the body. Photo by Jake Socha; x-ray image by Jake Socha and Wah-Keat Lee.
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