"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: adaptations for nocturnal vision in insect apposition eyes; kinase and phosphatase: the cog and spring of the circadian clock; a model for lymphatic regeneration in tissue repair of the muscle coat; calcium homeostasis in human placenta: role of calcium handling proteins; new insights into the cell biology of the marginal zone of the spleen; and, cell biology of cell activation and differentiation.