labeling

1. (biochemistry) The introduction of a traceable chemical group (e.g., containing an isotope or a fluorescent dye) into a protein or other biomolecule of interest so it can be tracked or quantified during experimental analysis.Examples: "There are two potential problems with this approach: first, the specificity of labeling depends on the purity of the LPS (if contaminants are present, they may be labeled also); second, removal of the label from the LPS in vivo might occur separately from processing of the LPS molecule itself."Synonyms: tagging#Nouncountableuncountable