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 transcription in haploid male germ cells, free radicals in cell biology, experimental studies on sexual reproduction in diatoms, vertebrate thymus and the neurotrophin system, and visualization of molecular activities inside living cells with fluorescent labels.