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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
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).
In cell biology, precursor cells—also called blast cells—are partially differentiated, or intermediate, and are sometimes referred to as progenitor cells. A precursor cell is a stem cell with the capacity to differentiate into only one cell type, meaning they are unipotent stem cells .
Exons in a messenger RNA precursor (pre-mRNA). Exons can include both sequences that code for amino acids (red) and untranslated sequences (grey). Introns — those parts of the pre-mRNA that are not in the mRNA — (blue) are removed, and the exons are joined (spliced) to form the final functional mRNA.
Approximately 50% of the synthetic catechol is consumed in the production of pesticides, the remainder being used as a precursor to fine chemicals such as perfumes and pharmaceuticals. [2] It is a common building block in organic synthesis. [19] Several industrially significant flavors and fragrances are prepared starting from catechol.
Hudson founded Precursor in 2015 as a generalist firm focusing on early stage companies and founders. The firm now has $230 million in AUM, and writes checks between $250,000 and $500,000.
DMA is also used as a precursor to other organic compounds. A study of the in vitro metabolism of N,N -dimethylaniline using guinea pig and rabbit preparations and GLC techniques has confirmed N -demethylation and N -oxidation as metabolic pathways, and has also established ring hydroxylation as a metabolic route.