Enhancers increase the probability but not the level of gene expression.
Transcriptional enhancers act in cis to suppress position-effect variegation.
E. The vagaries of variegating transgenes. Inhibition of granulocytic differentiation by mNotch1. An upstream activator of transcription coordinately increases the level and epigenetic stability of gene expression. Sutherland H, Martin DIK, Whitelaw E. A globin enhancer acts by increasing the proportion of erythrocytes expressing a linked transgene. Garrick D, Fiering S, Martin DIK, Whitelaw E. Repeat-induced genesilencing in mammals.