What is gene expression regulation?

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can you explain what it is in detail (WITHOUT USING WIKIPEDIA), can you tell me your source, can you include the following in your explanation: transcription factor, cellular communications, promoter, and enhancers.

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This means how you can turn off and turn on a gene, and what are the mechanisms to do it. It basically means control of transcription in the language of molecular biology.
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Gene regulation is the process by which your cells turn on and off genes.  While all your cells have the same DNA, what makes your cells do different things is which genes are in each cell.  Your skin cells don't make digestive enzymes because those genes are turned off.

Promoters are the regions of DNA right before a gene that act as a signal to the
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Regulation of gene expression (or gene regulation) refers to the cellular control of the amount and timing of changes to the appearance of the functional product of a gene. Although a functional gene product may be an RNA or a protein, the majority of known mechanisms regulate protein-coding genes. Any step of the gene's expression may be modulated, from DNA-RNA transcription to the post-translational modification of a
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Cells have to act in a coordinated way in an organ or in a body system such as the immune system. Some cells talk to each other using soluble molecules that move through the body's circulation. One class is cytokines that let immune cells communicate. These cytokine molecules act by binding a receptor on the target cell's surface. This means one cytokine can bind many types of cells so long as they display
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DNA replication is the duplication of one type of chromosome during the process during the telophase. In mitosis (for all non-gametic cells) the DNA replicates during telophase so that half of the diploid chromosome can be given to one daughter cell and the other half to another, and it also functions as a diploid (double-stranded) chromosome in general. As for gametes (sex cells), replication occurs during
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