Antidepressant-like effects of PDE4 inhibitors mediated by the high-affinity rolipram binding state (HARBS) of the phosphodiesterase-4 enzyme (PDE4) in rats. - Han-Ting Zhang; Yu Zhao; Ying Huang; Chengjun Deng; Hopper, Allen T.; De Vivo, Michael; Rose, Gregory M.; O'Donnell, James M. (Psychopharmacology, 2006)