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Customizations to metabolic caging systems. Example customizations to metabolic cages, such as (A) instrumenting cages with two 50 ml burettes to permit 2-bottle choice testing, (B) adding a food cup/hopper within the cage to hold pellets, pastes, or slurries that are incompatible with the standard hopper design, and/or (C) instrumenting drinking tubes with differential electrodes to serve as a voltage-based lickometer.
