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DNA transposon piggyBac (PB) is a newly established mutagen for large-scale mutagenesis in mice. We have designed and implemented an integrated database system called PBmice (PB Mutagenesis Information CEnter) for storing, retrieving and displaying the information derived from PB insertions (INSERTs) in the mouse genome. This system is centered on INSERTs with information including their genomic locations and flanking genomic sequences, the expression levels of the hit genes, and the expression patterns of the trapped genes if a trapping vector was used. It also archives mouse phenotyping data linked to INSERTs, and allows users to conduct quick and advanced searches for genotypic and phenotypic information relevant to a particular or a set of INSERT(s). Sequence-based information can be cross-referenced with other genomic databases such as Ensembl, BLAST and GBrowse tools used in …