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 endocrine disruption in invertebrates, the biology of lysenin, testican-1, transgenic mice as in vivo models of lymphomagenesis, bacterial endocytobionts of ciliophora, and Basic helix-loop-helix proteins expressed during early embryonic organogenesis.