A Small Composite Probasin Promoter Confers High Levels of Prostate-Specific Gene Expression through Regulation by Androgens and Glucocorticoids in Vitro and in Vivo**This work was supported by R01-DK-55748 from the NIH and the Frances Williams Preston Laboratories of the T. J. Martell Foundation. Transgenic mice were bred by the Transgenic Core/ES Cell Shared Resource of the Vanderbilt-Ingram Cancer Center (NCI Grant 2P30-CA-68485–05).