Gene Expression Patterns is devoted to the rapid publication of high quality studies of gene expression in development. Studies using cell culture are also suitable if clearly relevant to development, e.g., analysis of key regulatory genes or of gene sets in the maintenance or differentiation of stem cells. Key areas of interest include:-In-situ studies such as expression patterns of important or interesting genes at all levels, including transcription and protein expression-Temporal studies of large gene sets during development-Transgenic studies to study cell lineage in tissue formation