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; cell biology of t cell activation and differentiation.