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Ammonia sensor readings by mouse age in cages housing 5 adult male (black diamond) or 5 adult female (gray square) mice. Ammonia levels are coded as 1 (0–1 ppm), 2 (1–25 ppm), 3 (25–50 ppm), and 4 (more than 50 ppm). No significant correlation between age and ammonia level is seen in cages housing male mice (R2 = 0.1545) or female mice (R2 = 0.0217).
