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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 .
The Le gene encodes a fucosyltransferase that adds fucose to type 1 precursor substance (both free in serum and in secretions) to make the Le(a) antigen. The le gene is an amorph. The Lewis antigen produced on free type 1 precursor substance passively adsorbs onto the surfaces or red blood cells. [2]
Precursor (chemistry), a compound that participates in the chemical reaction that produces another compound; 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
Heme D is the site for oxygen reduction to water of many types of bacteria at low oxygen tension. [24] Heme S is related to heme B by having a formyl group at position 2 in place of the 2-vinyl group. Heme S is found in the hemoglobin of a few species of marine worms.
In addition, acetyl-CoA is a precursor for the biosynthesis of various acetyl-chemicals, acting as an intermediate to transfer an acetyl group during the biosynthesis of those acetyl-chemicals. Acetyl-CoA is also involved in the regulation of various cellular mechanisms by providing acetyl groups to target amino acid residues for post ...
H antigen can refer to one of the various types of antigens having diverse biological functions: . Also known as substance H, H antigen is a precursor to each of the ABO blood group antigens, apparently present in all people except those with the Bombay Blood phenotype [1] (see hh blood group).
Two themes exist across all Rosh Hashana food, and they are meant to symbolize ushering in a sweet and abundant new year.
When a food substance, supplement or medicine that contains a TMA precursor (choline or carnitine) is ingested. Some precursor is absorbed into the bloodstream in the small intestine before reaching the gut (the RDI of choline is 450–550 mg per day, [ 10 ] which is absorbed this way), however there is a limit to the transport capacity of the ...