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In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound. In biochemistry , the term "precursor" often refers more specifically to a chemical compound preceding another in a metabolic pathway , such as a protein precursor .
Precursor (physics), a phenomenon of wave propagation in dispersive media; Precursor in the course of a disease, a state preceding a particular stage in that course; Precursor cell (biology), a unipotent stem cell; Earthquake precursor, a diagnostic phenomenon that can occur before an earthquake; Gehrlein Precursor, a glider
This type of inactive precursor to an enzyme is known as a zymogen [90]: 149–53 or proenzyme. Quantity Enzyme production ( transcription and translation of enzyme genes) can be enhanced or diminished by a cell in response to changes in the cell's environment.
NK cells not only share many surface markers, functions and activities in common with T Cells, they also arise from a common T/NK progenitor. The T/NK precursor is also believed to be the source of a subpopulation of lymphoid DC. (Medical Immunology, p. 121) NK cells have a definition 'barcode' as CD3, CD16+, CD56t lymphocytes.
Vitamin A is a fat-soluble vitamin that is an essential nutrient.The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol, retinyl esters, and several provitamin (precursor) carotenoids, most notably β-carotene (beta-carotene).
Authorities have identified the woman who burned to death after she was set on fire inside a New York City subway train as 57-year-old Debrina Kawam.
Bottom line. Ultimately, whether you can retire on less than $1 million will largely depend on your spending needs during retirement and your remaining life expectancy.
existed, Canary recused herself anyway to avoid even an appearance of impropriety. I, Louis V. Franklin, Sr., was appointed Acting U.S. Attorney in the case after Charles Niven retired in January 2003.