This interdisciplinary work provides clear, concise, and up-to-date definitions of terms in the fields of cell biology, biochemistry, and biomedicine. Over 23,000 entries include 4,000 chemical structures and their functions and 1,100 equations of enzymatic reactions. About 600 restriction endonucleases and their specific activities are explained. Trade or brand names of drugs, mechanisms of action, and medicinal applications of antibiotics are defined. Molecular weights and chemical structures of the most commonly used chemicals, antibiotics, drugs, naturally occurring compounds, products of DNA recombinant technology and substances of environmental concern are all covered in this comprehensive reference.