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Intracage ammonia levels. (A) Comparison of average ammonia levels measured over the nest area during the learning phase (C57BL/6 study). (B) Comparison of average ammonia levels over the latrine during the learning phase (C57BL/6 study). (C) Average ammonia levels measured over the nest area (BALB/c study). (D) Average ammonia levels over the latrine (BALB/c study).
