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.