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Left: schematic diagram of the experimental setup. Mic, microphone for recording audio signal; Temp, air temperature in the chamber measured by a thermometer. Right: X-ray pictures illustrating the positions of the telemetry sensor (red arrow) and transmitter (green arrow) implanted in the intrapleural space and under the lower back skin of a mouse, respectively. The telemetry catheter was painted with a radio opaque ink (Creative Materials, Ayer, MA) for identifying its position.
