Slight anesthesia stabilizes the breathing parameters of Mecp2-/y adult mice. A, Plethysmographic recordings obtained from the same Mecp2-/y mouse when unanesthetized (A1) and anesthetized (A2). B, C, Frequency histograms present the number of occurrences of TTOT (B1, B2) and VT/B (C1, C2) values on 100 consecutive respiratory cycles during awake (B1, C1) and anesthetized (B2, C2) conditions in the same Mecp2-/y mouse.