- Alpha1-and beta2-adrenoceptors in the human liver with mass-forming intrahepatic cholangiocarcinoma: density and coupling to adenylate cyclase and phospholipase C. Kassahun, W.T., Günl, B., Tannapfel, A., Ungemach, F.R., Hauss, J., Abraham, G. Naunyn Schmiedebergs Arch. Pharmacol. (2005)