The marking of biological material with a dye or other reagent for the purpose of identifying and quantitating components of tissues, cells or their extracts.

The use of a dye, reagent, or other material for producing coloration or contrast in biological materials for examination or observation.

Synonyms: Histological Labelings, Labeling, Histological, Labeling and Staining, Staining and Labeling, Stainings, Staining, Labelings, Histological, Histological Labeling