Welcome to CELLS! The web site to accompany Benjamin Lewin’s text CELLS. This collection of resources and learning tools will improve your grasp of course content and expand your knowledge of cell biology. Look for the I-links icon appearing throughout the book. It identifies topics that are matched to additional resources on this site, including interactive figures and animations, visual aids that are essential to understanding the dynamic nature of cells. Biochemistry chapters provide background information on the proteins that are integral to the structure and function of cells. Lecture outlines and the Interactive Glossary allow you to quickly access they key points and terms introduced throughout the text. We hope this website enhances your course experience and helps to open doors into the fascinating world of cell biology.