While due to a high inter-individual variability, that change did not reach statistical significance, a significant difference between the higher corticosterone serum level in Lewis rats compared to Wistar rats could be detected at the 2 weeks time-point, suggesting that both strains differently respond to and recover from stress stimuli (Koolhaas et al., 1999 ).
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Differences in Stress-Induced Modulation of the Auditory System Between Wistar and Lewis Rats.
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