Description:ContentsS. Rospert, M. Rakwalska and Y. Dubaqui?Polypeptide chain termination and stop codon readthrough on eukaryotic ribosomes A.S. VerkmanNovel roles of aquaporins revealed by phenotype analysis of knockout mice M.J. Cismowski and S.M. LanierActivation of heterotrimeric G-proteins independent of a G-protein coupled receptor and the implications for signal processing