In humans,typically only infants produce the enzyme lactase to break down lactose.Some adults have changes in _____ that allow transcription factors to bind and turn on expression of the lactase gene into adulthood.

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Enhancers are DNA sequences that can activate the transcription of genes. In the case of lactase persistence, changes in enhancer regions of the lactase gene allow binding of specific transcription factors that keep the gene turned on into adulthood. As a result, lactose can continue to be efficiently digested.

In Humans,typically Only Infants Produce the Enzyme Lactase to Break