Urocortin 2-deficient mice exhibit gender-specific alterations in circadian hypothalamus-pituitary-adrenal axis and depressive-like behavior - Chen, A; Zorrilla, E; Smith, S; Rousso, D; Levy, C; Vaughan, J; Donaldson, C; Roberts, A; Lee, K F; Vale, W (J Neurosci, 2006)