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The Tol2 transposon system can create chromosomal insertions in the zebrafish germ lineage very efficiently. We constructed a Tol2-based gene trap vector, T2KSAG, which contains a splice accepter, the GFP gene and the polyA signal. In the pilot screen for gene trapping using T2KSAG, we identified 38 fish lines expressing GFP in specific organs and tissues. In the SAGp53A line, GFP is expressed in...
Genes involved in vertebrate development are unusually enriched for highly conserved non-coding sequence elements. These regions are readily detected in silico, by genome-wide sequence comparisons between different vertebrates, from mammals to fish (phylogenetic footprinting). It follows that sequence conservation must be the result of positive selection for an essential physiological role. An obvious...
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