The transport volumes of the Biomembranes series were initiated with Volumes 125 and 126 of Methods in Enzymology, which covered Transport in Bacteria, Mitochondria, and Chloroplasts. Volumes 156 and 157 continued the theme with ATP-Driven Pumps and Related Transport. Cellular and Subcellular Transport: Eukaryotic (Nonepithelial) Cells was the topic of Volumes 173 and 174. The theme of this volume, as well as of Volume 192, is Cellular and Subcellular Transport: Epithelial Cells.