Enhancer: a more inclusive term for a UASplugin-autotooltip__default plugin-autotooltip_bigUpstream activator sequence (UAS): In a general sense, a UAS is a cis-acting regulatory element, usually located significantly upstream of the promoter and TATA box, to which transactivators bind to activate transcription of nearby genes.

Although the term “UAS” can in principle be used to describe any cis-acting upstream sequence that activates transcription, in practice the term enhancer is used more often to describe these $GAL1$. One reason this is a more inclusive term is because not all enhancers are located upstreamplugin-autotooltip__default plugin-autotooltip_bigUpstream/downstream: These descriptors have different meanings depending on context:

* In genetics, these are terms used to describe directions on DNA, usually relative to the transcription start site of a gene. DNA sequences that are located in the same direction as the direction of of genesplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-); some enhancers are located downstreamplugin-autotooltip__default plugin-autotooltip_bigUpstream/downstream: These descriptors have different meanings depending on context:

* In genetics, these are terms used to describe directions on DNA, usually relative to the transcription start site of a gene. DNA sequences that are located in the same direction as the direction of of a geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-), and in some cases can even be located inside a geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-).