International Review of Cytology presents current advances and comprehensive reviews in cell biology ¿ both plant and animal. Authored by some of the foremost scientists in the field, each volume provides up-to-date information and directions for future research. Articles in this volume address Plastid RNA polymerases, promoters, and transcription regulators in higher plants, Maintenance of Golgi Apparatus Structure in the Face of Continuous Protein Recycling to the ER: Making Ends Meet, Nucleocytoplasmic trafficking in plant cells, Building in vitro models of organs, Mitrochondria-drived organelles in protists and fungi, The flagellum of trypanosomes, and Regulation of growth and differentiation in Dictyostelium.