In this volume of Reviews of Physiology there are three outstanding contributions, the first on Selenium-containing proteins in mammals and other forms of life, and the second on constitutively active and G-protein coupled inward rectifier K+ channels: Kir2.0 and Kir3.0 and the third on Chloroplast quest: a journey from the cytosol into the chloroplast and beyond.

Selenium-containing proteins in mammals and other forms of life.- Constitutively active and G-protein coupled inward rectifier K+ channels: Kir2.0 and Kir3.0.- Chloroplast quest: A journey from the cytosol into the chloroplast and beyond.