Entrainment impaired, masking spared: an apparent genetic abnormality that prevents circadian rhythm entrainment to 24-h lighting cycles in California mice.

Abstract excerpt

Lighting cycles can influence the expression of daily activity rhythms in two ways: by entraining the circadian pacemaker that normally drives this rhythm, and by directly affecting the expression of activity itself, thereby 'masking' the influence of the pacemaker. We describe a California mouse (Peromyscus californicus) in which these processes are dissociated. Circadian rhythms of wheel-running activity were...

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