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 multihormonal control of vitellogenesis in lower vertebrates; structure, evolutionary conservation and functions of angiotensin- and endothelin-converting enzymes; cell and molecular biology of nucleolar assembly and disassembly; and MAPping the eukaryotic tree of life: structure, function, and evolution of the MAP215/Dis1 family of microtubule-associated proteins.