abundance abu The abundance of a chemical (if chemical synthesis is not known). activity act An elemental function of a molecule. binding b A molecular interaction. cotreatment w Involving the use of two or more chemicals simultaneously. expression exp The expression of a gene product. folding fol The bending and positioning of a molecule to achieve conformational integrity. localization loc Part of the cell where a molecule resides. metabolic processing met The biochemical alteration of a molecule's structure (does not include changes in expression, stability, folding, localization, splicing, or transport). acetylation ace The addition of an acetyl group. met acylation acy The addition of an acyl group. met alkylation alk The addition of an alkyl group. met amination ami The addition of an amine group. met carbamoylation car The addition of a carbamoyl group. met carboxylation cox The addition of a carboxyl group. met chemical synthesis csy A biochemical event resulting in a new chemical product. met degradation deg Catabolism or breakdown. met cleavage clv The processing or splitting of a molecule, not necessarily leading to the destruction of the molecule. deg hydrolysis hyd The splitting of a molecule via the specific use of water. clv ethylation eth The addition of an ethyl group. met glutathionylation glt The addition of a glutathione group. met glycation gyc The non-enzymatic addition of a sugar. met glycosylation gly The addition of a sugar group. met glucuronidation glc The addition of a sugar group to form a glucuronide, typically part of an inactivating or detoxifying reaction. gly N-linked glycosylation ngl The addition of a sugar group to an amide nitrogen. gly O-linked glycosylation ogl The addition of a sugar group to a hydroxyl group. gly hydroxylation hdx The addition of a hydroxy group. met lipidation lip The addition of a lipid group. met farnesylation far The addition of a farnesyl group. lip geranoylation ger The addition of a geranoyl group. lip myristoylation myr The addition of a myristoyl group. lip palmitoylation pal The addition of a palmitoyl group. lip prenylation pre The addition of a prenyl group. lip methylation myl The addition of a methyl group. met nitrosation nit The addition of a nitroso or nitrosyl group. met nucleotidylation nuc The addition of a nucleotidyl group. met oxidation oxd The loss of electrons. met phosphorylation pho The addition of a phosphate group. met reduction red The gain of electrons. met ribosylation rib The addition of a ribosyl group. met ADP-ribosylation arb The addition of a ADP-ribosyl group. rib sulfation sul The addition of a sulfate group. met sumoylation sum The addition of a SUMO group. met ubiquitination ubq The addition of an ubiquitin group. met mutagenesis mut The genetic alteration of a gene product. reaction rxn Any general biochemical or molecular event. response to substance rec Resistance or sensitivity to a substance. splicing spl The removal of introns to generate mRNA. stability sta Overall molecular integrity. transport trt The movement of a molecule into or out of a cell. secretion sec The movement of a molecule out of a cell (by less specific means than export). trt export ext The movement of a molecule out of a cell (by more specific means than secretion). sec uptake upt The movement of a molecule into a cell (by less specific means than import). trt import imt The movement of a molecule into a cell (by more specific means than uptake). upt