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The oldest and most widely used expression systems are cell-based and may be defined as the "combination of an expression vector, its cloned DNA, and the host for the vector that provide a context to allow foreign gene function in a host cell, that is, produce proteins at a high level".
Protein expression may refer to: Gene expression , the processes that convert the information of DNA genes into a functional copies of mRNA in living cells Protein production , the method of generating some quantity of a specific protein in biotechnology
Protein production, the process of generating some quantity of a specific protein using living organisms; Protein purification, the process of separating a specific protein from a mixture of proteins and other molecules; Protein Expression and Purification, a peer-reviewed scientific journal on these biotechnology topics
Regulation of gene expression by a hormone receptor Diagram showing at which stages in the DNA-mRNA-protein pathway expression can be controlled. Regulation of gene expression, or gene regulation, [1] includes a wide range of mechanisms that are used by cells to increase or decrease the production of specific gene products (protein or RNA).
Expression proteomics includes the analysis of protein expression at a larger scale. It helps identify main proteins in a particular sample, and those proteins differentially expressed in related samples—such as diseased vs. healthy tissue. If a protein is found only in a diseased sample then it can be a useful drug target or diagnostic marker.
Measuring gene expression is an important part of many life sciences, as the ability to quantify the level at which a particular gene is expressed within a cell, tissue or organism can provide a lot of valuable information. For example, measuring gene expression can: Identify viral infection of a cell (viral protein expression).
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