Contains over 4,500 articles divided into three different categories: Introductory, Advanced and Keynote. Introductory articles have been written primarily for undergraduate and non-specialists requiring the basic concepts of a particular subject. Advanced articles provide a more detailed discussion of specialist subjects, equivalent to that found in graduate level texts. Keynote articles provide a platform for debate where controversial issues and 'hot topics' can be discussed. Subject areas include Biochemistry, Cell Biology, Developmental Biology, Ecology, Evolution and Diversity of Life, Genetics and Disease, Genetics and Molecular Biology, Immunology, Microbiology, Neuroscience, Plant Science, Science and Society, Structural Biology, and Virology. The glossary includes biochemical and taxonomic information, acronyms, synonyms, units and other technical data.