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Neonatal body weight (A), body temperature (B), ultrasonic vocalization (USV) rate (C) and duration (D) in B6 (n = 16), FVB (n = 20), and CD‐1 pups (n = 20). Neonatal USVs at postnatal day (pnd) 2, 4, 6, 8, and 12 are emitted by pups in response to social isolation (3‐minute session). Significant difference between B6 and FVB (p < 0.05*, p < 0.01**); B6 and CD‐1 (p < 0.05#, p < 0.01##); FVB and CD‐1 (p < 0.01$$). Data are expressed as median ± 1st and 3rd interquartile.
