upregulation

noun
up·reg·u·la·tion | \ˈəp-ˌreg-yə-ˈlā-shən, -ˌreg-ə-ˈlā- \

Medical Definition of upregulation 

: the process of increasing the response to a stimulus specifically : increase in a cellular response to a molecular stimulus due to increase in the number of receptors on the cell surface

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