"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 the Keratins of the human hair follicle; calcium channels and Ca2+ fluctuations in sperm physiology; genomic imprinting: cis-acting sequences and regional control; insulin-like growth factor signaling in fishes; cell biology of cardiac cushion development.