Beta 1- and beta 2-adrenergic-receptor subpopulations in nonfailing and failing human ventricular myocardium: Coupling of both receptor subtypes to muscle contraction and selective beta 1-receptor down-regulation in heart failure - Bristow, M R; Ginsburg, R; Umans, V; Fowler, M; Minobe, W; Rasmussen, R; Zera, P; Menlove, R; Shah, P; Jamieson, S (Circ Res, 1986)