Enhancer

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Enhancer sequences do what their name suggests: They act to enhance the rate at which genes are transcribed, and their effects can be quite powerful. Enhancers can be thousands of nucleotides away from the promoters with which they interact, but they are brought into proximity by the looping of DNA. This looping is the result of interactions between the proteins bound to the enhancer and those bound to the promoter. The proteins that facilitate this looping are called activators, while those that inhibit it are called repressors.

http://www.nature.com/scitable/topicpage/dna-transcription-426

Enhancerome

http://www.nature.com/nature/journal/v507/n7493/full/nature12787.html

http://anderssonr.wordpress.com/2014/04/01/identification-of-bidirectionally-transcribed-loci-and-prediction-of-enhancers/

http://enhancer.binf.ku.dk/Welcome.html

http://fantom.gsc.riken.jp/5/datafiles/latest/extra/Enhancers/