The Cytokine FactsBook contains over 70 entries on cytokines and growth factors and their receptors including the interleukins, interferons, EL8 superfamily, growth factors, colony stimulating factors and tumour necrosis factors. It contains information on: Alternative Nomenclature, Cellular Expression, Cross Species Reactivity, Bioassays, Gene Organization and Chromosomal Location, Protein Structure and Molecular Weights, Amino Acid Sequences of Human and Mouse Proteins, Database Accession Numbers, Biological Function, Key References.