DAB (3,3'-Diaminobenzidine)

DAB, or 3,3'-Diaminobenzidine, is a chemical commonly used in scientific and medical laboratories to detect specific proteins or molecules in tissue samples. When it reacts with an enzyme called peroxidase, it produces a brown-colored precipitate, effectively marking the presence of the target substance. This color change helps researchers visualize and locate specific components within cells or tissues under a microscope, aiding diagnoses or scientific studies. DAB is valued for producing a stable, visible stain that provides clear, detailed insights into biological structures.